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19 gru 2021 Abaqus which is used by the CalculiX solver ccx. • Ansys



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17 gru 2021 CalculiX GraphiX (cgx) resulting in the mesh in Figure 2. For reasons of clarity only element labels are displayed.



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17 lip 2020 This document is the description of CalculiX GraphiX (cgx). This program is ... Abaqus which is used by the CalculiX solver ccx.



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:

CalculiX USER"S MANUAL

- CalculiX GraphiX, Version 2.17 -

Klaus Wittig

July 17, 2020

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

Contents1 Introduction8

2 Concept8

3 File Formats9

4 Getting Started11

5 Program Parameters15

6 Input Devices16

6.1 Mouse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

7 Menu17

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

7.1.1 Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2 Viewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.2.1 Show Elements With Light . . . . . . . . . . . . . . . . . 19

7.2.2 Show Bad Elements . . . . . . . . . . . . . . . . . . . . . 19

7.2.3 Fill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

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

7.2.6 Toggle Culling Back/Front . . . . . . . . . . . . . . . . . 20

7.2.7 Toggle Illuminate Backface . . . . . . . . . . . . . . . . . 20

7.2.8 Toggle Model Edges . . . . . . . . . . . . . . . . . . . . . 20

7.2.9 Toggle Element Edges . . . . . . . . . . . . . . . . . . . . 20

7.2.10 Toggle Surfaces/Volumes . . . . . . . . . . . . . . . . . . 20

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

7.2.12 Toggle Background Color . . . . . . . . . . . . . . . . . . 21

7.2.13 Toggle Vector-Plot . . . . . . . . . . . . . . . . . . . . . . 21

7.2.14 Toggle Add-Displacement . . . . . . . . . . . . . . . . . . 21

7.2.15 Toggle Shaded Result . . . . . . . . . . . . . . . . . . . . 21

7.2.16 Toggle Transparency . . . . . . . . . . . . . . . . . . . . . 21

7.2.17 Toggle Ruler . . . . . . . . . . . . . . . . . . . . . . . . . 21

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

7.3.1 Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.3.2 Tune-Value . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.3.3 Steps per Period . . . . . . . . . . . . . . . . . . . . . . . 22

7.3.4 Time per Period . . . . . . . . . . . . . . . . . . . . . . . 22

7.3.5 Toggle Real Displacements . . . . . . . . . . . . . . . . . 22

7.3.6 Toggle Static Model Edges . . . . . . . . . . . . . . . . . 22

7.3.7 Toggle Static Element Edges . . . . . . . . . . . . . . . . 22

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

7.4 Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2

7.5 Zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.6 Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.7 Enquire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.8 Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.9 Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237.10 User . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247.11 Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.1 +x View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.2 -x View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.3 +y View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.4 -y View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.5 +z View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.11.6 -z View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.12 Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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

7.12.2 Ps-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.12.3 Gif-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.12.4 Png-Hardcopy . . . . . . . . . . . . . . . . . . . . . . . . 25

7.12.5 Start Recording Gif-Movie . . . . . . . . . . . . . . . . . . 25

7.13 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.14 Toggle CommandLine . . . . . . . . . . . . . . . . . . . . . . . . 25

7.15 Quit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8 Customization26

9 Commands26

9.1 anim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.2 area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.3 asgn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

9.4 bia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

9.5 body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.6 break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.7 call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.8 capt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.9 cntr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.10 col . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.11 comp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.12 copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.13 corrad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.14 csysa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.15 cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.16 del . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.17 dist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.18 div . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.19 ds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.20 elem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

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9.21 else . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419.22 else if . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419.23 elty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419.24 endif . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.25 endwhile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439.26 enq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449.27 eprop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459.28 eqal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459.29 exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.30 fil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.31 flip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.32 flpc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.33 font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469.34 frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.35 gbod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.36 gonly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.37 graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479.38 grpa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499.39 grps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.40 gsur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.41 gtol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.42 hcpy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.43 help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519.44 if . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.45 int . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.46 init . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529.47 lcmb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.48 length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.49 line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539.50 lnor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.51 mata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.52 map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549.53 mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559.54 max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559.55 maxc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569.56 maxr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569.57 menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569.58 merg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569.59 mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 579.60 mids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.61 min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.62 minc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.63 minr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.64 minus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589.65 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599.66 move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

4

9.67 movi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609.68 msg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629.69 mshp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629.70 neigh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639.71 node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659.72 norm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669.73 nurl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669.74 nurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669.75 ori . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679.76 plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679.77 plus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699.78 pnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709.79 prnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709.80 proj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739.81 qadd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749.82 qali . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749.83 qbia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 759.84 qbod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 759.85 qcnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.86 qcut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.87 qdel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.88 qdis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 769.89 qdiv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789.90 qenq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789.91 qfil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 799.92 qflp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 809.93 qint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819.94 qlin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819.95 qmsh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 829.96 qnor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.97 qpnt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.98 qnod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.99 qrem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849.100qseq . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859.101qshp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859.102qspl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 869.103qsur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 869.104qtxt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 879.105quit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889.106read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889.107rep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929.108rnam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929.109rot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929.110save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 939.111scal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 939.112send . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

5

9.113seqa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1069.114seqc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1079.115seql . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1079.116seta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1079.117setc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.118sete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.119seti . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109.120seto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109.121setr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109.122shpe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1119.123split . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1129.124stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.125steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.126surf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.127swep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.128sys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1159.129test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1169.130thrs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1169.131tra . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1179.132trfm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1179.133txt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1189.134ucut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1199.135ulin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1199.136val . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1199.137valu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1209.138view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1229.139volu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1239.140while . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1249.141wpos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1249.142wsize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1249.143zap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1249.144zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

10 Element Types126

11 Result Format132

11.1 Model Header Record . . . . . . . . . . . . . . . . . . . . . . . . 133

11.2 User Header Record . . . . . . . . . . . . . . . . . . . . . . . . . 133

11.3 Nodal Point Coordinate Block . . . . . . . . . . . . . . . . . . . . 133

11.4 Element Definition Block . . . . . . . . . . . . . . . . . . . . . . 134

11.5 Parameter Header Record . . . . . . . . . . . . . . . . . . . . . . 135

11.6 Nodal Results Block . . . . . . . . . . . . . . . . . . . . . . . . . 136

6

12 Pre-defined Calculations138

12.1 Von Mises Equivalent Stress . . . . . . . . . . . . . . . . . . . . . 138

12.2 Von Mises Equivalent Strain . . . . . . . . . . . . . . . . . . . . . 139

12.3 Principal Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

12.4 Principal Strains . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

12.5 maxShear Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . 139

12.6 Cylindrical Stresses . . . . . . . . . . . . . . . . . . . . . . . . . . 139

12.7 Weighted Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

13 Meshing rules140

14 User-Functions140

A Known Problems141

A.1 Program is not responding . . . . . . . . . . . . . . . . . . . . . . 141 A.2 Program generates a segmentation fault . . . . . . . . . . . . . .141

B Tips and Hints141

B.1 How to change the format of the movie file . . . . . . . . . . . . 141 B.2 How to get the sets from a geo- or ccx-inp file for post-processing 141 B.3 How to define a set of entities . . . . . . . . . . . . . . . . . . . . 142 B.4 How to enquire node numbers and values at certain locations . . 143 B.5 How to select only nodes on the surface . . . . . . . . . . . . . . 143 B.6 How to write values to a file . . . . . . . . . . . . . . . . . . . . . 143 B.7 How to generate a user dataset . . . . . . . . . . . . . . . . . . . 144 B.8 How to generate a time-history plot . . . . . . . . . . . . . . . . 144 B.9 How the mesh is related to the geometry . . . . . . . . . . . . . . 145 B.10 How to change the order of elements . . . . . . . . . . . . . . . . 146 B.11 How to connect independent meshes . . . . . . . . . . . . . . . . 146 B.12 How to define loads and constraints . . . . . . . . . . . . . . . . 146 B.13 How to map loads . . . . . . . . . . . . . . . . . . . . . . . . . . 147 B.14 How to run cgx in batch mode . . . . . . . . . . . . . . . . . . . 149 B.15 How to process results . . . . . . . . . . . . . . . . . . . . . . . . 149 B.16 How to deal with CAD-geometry . . . . . . . . . . . . . . . . . . 150 B.17 How to check an input file for ccx . . . . . . . . . . . . . . . . . . 155 B.18 Remarks Concerning Ansys . . . . . . . . . . . . . . . . . . . . . 157 B.19 Remarks Concerning Code Aster . . . . . . . . . . . . . . . . . . 157 B.20 Remarks Concerning dolfyn . . . . . . . . . . . . . . . . . . . . . 158 B.21 Remarks Concerning Duns and Isaac . . . . . . . . . . . . . . . . 158 B.22 Remarks Concerning Nastran . . . . . . . . . . . . . . . . . . . . 159 B.23 Remarks Concerning NETGEN . . . . . . . . . . . . . . . . . . . 159 B.24 Remarks Concerning OpenFOAM . . . . . . . . . . . . . . . . . . 160 B.25 Remarks Concerning Samcef . . . . . . . . . . . . . . . . . . . . . 160 7

C Simple Examples162

C.1 Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 C.2 Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 C.3 Sphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 C.4 Sphere (Volume) . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 C.5 Airfoil for cfd codes . . . . . . . . . . . . . . . . . . . . . . . . . 167 C.6 If and while demo . . . . . . . . . . . . . . . . . . . . . . . . . . 172 C.7 Data storage in a user dataset . . . . . . . . . . . . . . . . . . . . 174 C.8 User File Parser . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

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 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 the program ng vol (part of NETGEN [4]) is accessible (see also "How to deal with CAD-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. As a result, if you modify the position of a point, all related geometry will follow. In other words, if the location of geometric entities is changed, it is 8 necessary to move the points on which the entities rely. It should be noted that 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 "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. Additional commands, material description and so onmust be added with the help of an external editor. Existing fields like a pressure distribution or temperatures my be mapped from one mesh to another. Pleasesee "How to map loads" how to do that. 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. Theouter faces can be switched off to make inner structures like a cavity visibleor certain faces may be displayed in a transparent manner. Also, a cut throughthe 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 "call"). Both the pre- and post- processing can be automated in batch-mode (see "How to run cgx in batch mode").quotesdbs_dbs15.pdfusesText_21
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