[PDF] CalculiX USERS MANUAL - CalculiX GraphiX Version 2.14 -

View - Download CalculiX USERS MANUAL - CalculiX GraphiX Version 2.14 -

Previous PDF

Next PDF

CalculiX USER"S MANUAL

- CalculiX GraphiX, Version 2.14 -

Klaus Wittig

May 29, 2018

Figure 1: A complex model made from scratch using second order brick elements 1

Contents1 Introduction7

2 Concept8

3 File Formats9

4 Getting Started10

5 Program Parameters14

6 Input Devices15

6.1 Mouse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.2 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 Menu17

7.1 Datasets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.1.1 Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2 Viewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2.1 Show Elements With Light . . . . . . . . . . . . . . . . . 18

7.2.2 Show Bad Elements . . . . . . . . . . . . . . . . . . . . . 18

7.2.3 Fill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7.2.4 Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2.5 Dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2.6 Toggle Culling Back/Front . . . . . . . . . . . . . . . . . 19

7.2.7 Toggle Illuminate Backface . . . . . . . . . . . . . . . . . 19

7.2.8 Toggle Model Edges . . . . . . . . . . . . . . . . . . . . . 19

7.2.9 Toggle Element Edges . . . . . . . . . . . . . . . . . . . . 19

7.2.10 Toggle Surfaces/Volumes . . . . . . . . . . . . . . . . . . 19

7.2.11 Toggle Move-Z/Zoom . . . . . . . . . . . . . . . . . . . . 20

7.2.12 Toggle Background Color . . . . . . . . . . . . . . . . . . 20

7.2.13 Toggle Vector-Plot . . . . . . . . . . . . . . . . . . . . . . 20

7.2.14 Toggle Add-Displacement . . . . . . . . . . . . . . . . . . 20

7.2.15 Toggle Shaded Result . . . . . . . . . . . . . . . . . . . . 20

7.3 Animate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.3.1 Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.3.2 Tune-Value . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.3.3 Steps per Period . . . . . . . . . . . . . . . . . . . . . . . 21

7.3.4 Time per Period . . . . . . . . . . . . . . . . . . . . . . . 21

7.3.5 Toggle Real Displacements . . . . . . . . . . . . . . . . . 21

7.3.6 Toggle Static Model Edges . . . . . . . . . . . . . . . . . 21

7.3.7 Toggle Static Element Edges . . . . . . . . . . . . . . . . 21

7.3.8 Toggle Dataset Sequence . . . . . . . . . . . . . . . . . . . 22

7.4 Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.5 Zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.6 Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2

7.7 Enquire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227.8 Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227.9 Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.10 User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.11 Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.1 +x View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.2 -x View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.3 +y View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.4 -y View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.5 +z View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.11.6 -z View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.12 Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.12.1 Tga-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . 24

7.12.2 Ps-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.12.3 Gif-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.12.4 Png-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . 24

7.12.5 Start Recording Gif-Movie . . . . . . . . . . . . . . . . . . 24

7.13 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.14 Quit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8 Customization25

9 Commands25

9.1 anim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.2 area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

9.3 asgn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.4 bia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.5 body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.6 break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.7 call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.8 cntr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.9 comp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.10 copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.11 corrad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.12 csysa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.13 cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

9.14 del . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

9.15 dist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.16 div . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.17 ds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.18 elem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.19 else . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.20 elty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.21 endif . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.22 endwhile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.23 enq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3

9.24 eprop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429.25 eqal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429.26 exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429.27 fil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429.28 flip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.29 flpc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.30 font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.31 frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.32 gbod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.33 gonly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.34 graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.35 grpa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.36 grps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.37 gsur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.38 gtol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.39 hcpy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489.40 help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489.41 if . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489.42 int . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499.43 init . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499.44 lcmb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499.45 length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.46 line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.47 lnor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.48 mata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.49 map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.50 mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.51 max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.52 maxr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.53 merg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.54 menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.55 mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.56 mids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.57 min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.58 minr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.59 minus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559.60 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559.61 move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559.62 movi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 579.63 msg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.64 mshp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.65 node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599.66 norm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599.67 nurl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599.68 nurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609.69 ori . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

4

9.70 plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619.71 plus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629.72 pnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629.73 prnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639.74 proj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659.75 qadd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669.76 qali . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679.77 qbia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679.78 qbod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679.79 qcnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689.80 qcut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689.81 qdel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699.82 qdis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699.83 qdiv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709.84 qenq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709.85 qfil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 729.86 qflp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 729.87 qint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739.88 qlin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739.89 qmsh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749.90 qnor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 759.91 qpnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.92 qnod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.93 qrem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.94 qseq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 779.95 qshp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 779.96 qspl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 779.97 qsur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789.98 qtxt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 799.99 quit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 799.100read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 799.101rep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 839.102rnam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 839.103rot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.104save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.105scal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.106send . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859.107seqa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 979.108seqc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 979.109seql . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 989.110seta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 989.111setc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 999.112sete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 999.113seti . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009.114seto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009.115setr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

5

9.116shpe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1019.117split . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1029.118stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1029.119steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1039.120surf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1039.121swep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1049.122sys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069.123test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069.124thrs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069.125tra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1079.126trfm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1079.127txt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1089.128ucut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.129ulin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.130valu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.131view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1119.132volu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1129.133while . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1129.134wpos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.135wsize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.136zap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.137zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

10 Element Types115

11 Result Format121

11.1 Model Header Record . . . . . . . . . . . . . . . . . . . . . . . . 122

11.2 User Header Record . . . . . . . . . . . . . . . . . . . . . . . . . 122

11.3 Nodal Point Coordinate Block . . . . . . . . . . . . . . . . . . . . 122

11.4 Element Definition Block . . . . . . . . . . . . . . . . . . . . . . 123

11.5 Parameter Header Record . . . . . . . . . . . . . . . . . . . . . . 124

11.6 Nodal Results Block . . . . . . . . . . . . . . . . . . . . . . . . . 124

12 Pre-defined Calculations127

12.1 Von Mises Equivalent Stress . . . . . . . . . . . . . . . . . . . . . 127

12.2 Von Mises Equivalent Strain . . . . . . . . . . . . . . . . . . . . . 127

12.3 Principal Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

12.4 Principal Strains . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

12.5 maxShear Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . 128

12.6 Cylindrical Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . 128

13 Meshing rules128

14 User-Functions129

6

A Known Problems129

A.1 Program is not responding . . . . . . . . . . . . . . . . . . . . . . 129 A.2 Program generates a segmentation fault . . . . . . . . . . . . . .129

B Tips and Hints129

B.1 How to change the format of the movie file . . . . . . . . . . . . 130 B.2 How to get the sets from a geo- or ccx-inp file for post-processing 130 B.3 How to define a set of entities . . . . . . . . . . . . . . . . . . . . 131 B.4 How to enquire node numbers and values at certain locations . . 131 B.5 How to write values to a file . . . . . . . . . . . . . . . . . . . . . 131 B.6 How to select only nodes on the surface . . . . . . . . . . . . . . 132 B.7 How to generate a time-history plot . . . . . . . . . . . . . . . . 132 B.8 How the mesh is related to the geometry . . . . . . . . . . . . . . 133 B.9 How to change the order of elements . . . . . . . . . . . . . . . . 134 B.10 How to connect independent meshes . . . . . . . . . . . . . . . . 134 B.11 How to define loads and constraints . . . . . . . . . . . . . . . . 134 B.12 How to map loads . . . . . . . . . . . . . . . . . . . . . . . . . . 135 B.13 How to run cgx in batch mode . . . . . . . . . . . . . . . . . . . 137 B.14 How to process results . . . . . . . . . . . . . . . . . . . . . . . . 137 B.15 How to deal with cad-geometry . . . . . . . . . . . . . . . . . . . 138 B.16 How to check an input file for ccx . . . . . . . . . . . . . . . . . . 141 B.17 Remarks Concerning Ansys . . . . . . . . . . . . . . . . . . . . . 142 B.18 Remarks Concerning Code Aster . . . . . . . . . . . . . . . . . . 142 B.19 Remarks Concerning dolfyn . . . . . . . . . . . . . . . . . . . . . 143 B.20 Remarks Concerning Duns and Isaac . . . . . . . . . . . . . . . . 143 B.21 Remarks Concerning Nastran . . . . . . . . . . . . . . . . . . . . 144 B.22 Remarks Concerning NETGEN . . . . . . . . . . . . . . . . . . . 144 B.23 Remarks Concerning OpenFOAM . . . . . . . . . . . . . . . . . . 145 B.24 Remarks Concerning Samcef . . . . . . . . . . . . . . . . . . . . . 145

C Simple Examples147

C.1 Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 C.2 Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 C.3 Sphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 C.4 Sphere (Volume) . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 C.5 Airfoil for cfd codes . . . . . . . . . . . . . . . . . . . . . . . . . 152 C.6 If and while demo . . . . . . . . . . . . . . . . . . . . . . . . . . 157

1 Introduction

This document is the description of CalculiX GraphiX (cgx).This program is designed to generate and display finite elements (FE) and results coming from CalculiX CrunchiX (ccx). If you have any problems using cgx,this document should solve them. If not, you might send an email to the author [3]. The Con- cept and File Format sections give some background on functionality and mesher 7 capabilities. The Getting Started section describes how torun the verification examples you should have obtained along with the code of the program. You might use this section to check whether you installed CalculiX correctly. Then, a detailed overview is given of the menu and all the availablekeywords in al- phabetical order in the Menu and Commands sections respectively. Finally, the User"s Manual ends with the appendix and some references used while writing the code.

2 Concept

This program uses the openGL library for visualization and the glut library [2] for window management and event handling. This results in very high speed if a hardware-accelerated openGL-library is available andstill high speed for software-rendering (MesaGL,[1]). The cgx has pre- and post-processor capabilities. It is ableto generate and display beam, shell and brick elements in its linear and quadratic form (fig. 1), tets can be generated from within cgx if NETGEN [4] is installed and the pro- gram ng vol (part of NETGEN) is accessible (see also "How to deal withcad-geometry"). The built-in mesher creates a structured mesh based on a description of the geometry. For example, it uses lines for beam elements, surfaces for shell elements and volumes (bodies) for brick elements. The program distinguishes between the mesh and the underlying geometry. Elements are made from faces and faces are made from nodes. If you move a node, the corresponding face(s) and element(s) will follow. The geometry behaves accordingto the mesh: Lines are made from points, surfaces are made from lines and bodiesare made of surfaces. Surfaces might have 3 to 5 edges and bodies might have 5 to 7 surfaces. As a result, if you modify the position of a point, all relatedgeometry will follow. In other words, if the location of geometric entities is changed, it is necessary to move the points on which the entities rely. It should be notedthat faces exist only on free surfaces of the model. In addition, entities can be grouped together to make sets. Sets are useful to handle parts of a model. For example, sets can be used to manipulate or display a few entities at a time (see also "How to define a set ofentities"). A simple but powerful entity which can store values (character strings) is also available. This values can be derived from previous commands or calculated results by using an internal stack. Simple calculations canbe performed. The values can be used to substitute parameters of subsequent commands. The user might measure a distance or calculate a distance and use thisvalue to move a part of the mesh. Together with a "while" loop, an "if" case distinguishing com- mand and the possibility to use system calls via the "sys" command, elaborated batch files can be written. After a mesh is created in cgx, it needs written to a file for usewith the solver. Likewise, several boundary conditions and loads can be written to files (see also "How to connect independent meshes", "How to define loads andconstraints" and "send"). These files need to be added into the control file for later use in ccx. 8 Additional commands, material description and so on must beadded with the help of an external editor. After the analysis is completed, the results can be visualized by calling the cgx program again in an independent session. The program is primary controlled by the keyboard with individual commands for each function.Only a subset of commands which are most important for post-processing isalso available through a pop-up menu. Shaded animations of static and dynamic results, the common color plots and time history plots can be created. Also, a cut through the model can be done which creates a section and it is possible to zoom through the model. Skilled users might include their own functions. For example someone may need his own functions to manipulate the result-data or he may need an interface to read or write his own results format (see also "call"). Both the pre- and post- processing can be automated in batch-mode (see also "How to run cgx in batch mode"). The program searches the home directoy for a file named ".cgx". The com- mands written there will be exected during startup. The usermight store there "menu" commands which link user written command files to the menu.

3 File Formats

It is hoped by the author that common CAD formats will be supported by stand-alone interfaces which translate into fbd-commands. So far vda, step and iges to fbd interfaces are available on the CalculiX home pages. Tet-meshes can be generated based on the resulting fbd-files. The following file-formats are available to write(w) and/or read(r) geometric entities: •fbd-format(r/w), this format consists of a collection of commands ex- plained in the section "Commands" and it is mainly used to store geo- metrical information like points, lines, surfaces and bodies. All geometry generated by the user is stored in this format. But it can alsobe used to define a batch job which uses the available commands. •step-format(r), reverse engineered based on some cad files.Only points and certain types of lines are supported currently. Be awareof the more powefull cad2fbd interface program on the CalculiX home page. •stl-format in ascii (r/w), this format describes a shape using only triangles. The following file-formats are available to write a mesh and certain boundary- conditions: •Abaqus, which is used by the CalculiX solver ccx. •Ansys, most boundary conditions available. •Code Aster, mesh and sets of nodes and elements are available. 9 •Samcef, mesh and sets of nodes and elements are available. •dolfyn, a free cfd-code [5]. •duns, a free cfd-code [6]. •isaac, a free cfd-code [7]. •OpenFOAM, a free cfd-code [8], only 8-noded brick-elementsare sup- ported. •Nastran, most boundary conditions available. •tochnog, a free fem-code [9], only 8-noded brick-elements are supported. The following solver-input-file-formats can be read to check the mesh, sets and certain boundary-conditions: •Abaqus, this is also used by the CalculiX solver ccx. •Netgen, read Netgen native format (.vol) The following file-formats are available to read solver results: •frd-format, files of this format are used to read results of previous calcula- tions like displacements and stresses. This format is described in section "Result Format." It is used by the CalculiX solver ccx. •duns, a free cfd-code [6], •isaac, a free cfd-code [7], •OpenFOAM, a free cfd-code [8]. •Nastran, the f06-file can be read (sf. only CHEXA, displacements and stresses). Unfortunatelly this format differs from versionto version and has to be adapted occasionally. For a more detailed description on how to use cgx to read this formats see "Program Parameters" and the program specific "Tips and Hints" sections. See the "send" command for how to write them from cgx.

4 Getting Started

For installation help, see .../Calculix/cgx

X.X/INSTALL. After the program is

installed on your machine, you should check the functionality by running the examples included in the distribution. The examples are located in .../Cal- culix/cgxquotesdbs_dbs29.pdfusesText_35

[PDF] calcul en ligne ce2

[PDF] calcul en ligne cp

[PDF] calcul en ligne ce1

[PDF] eduscol initiation a la programmation

[PDF] calcul en ligne cm2

[PDF] eduscol maths cycle 3

[PDF] calcul en ligne cm1

[PDF] eduscol grandeurs et mesures

[PDF] quelle est la formule pour calculer la puissance p consommée par un appareil en courant continu ?

[PDF] calculer l'énergie en joule

[PDF] formule datedif en anglais

[PDF] datedif en francais

[PDF] calculer le nombre d'heures entre deux dates excel

[PDF] loi normale ecart type inconnu

[PDF] statistique excel