# Tie constraints in linear static basic calculations **URL:** \ **Category:** General Questions\ **Created:** [October 18, 2023, 12:10pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191 "2023-10-18T12:10:53Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 18, 2023, 12:10pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/1 "2023-10-18T12:10:53Z")
It just not working well I have been using PPM/Calculix from 1.2 version and problem still exsists . this situation is especially when I have many tie constraints - merged best regards ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 18, 2023, 1:06pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/2 "2023-10-18T13:06:14Z")
> [@Michal](#): > > It just not working well > [@Michal](#): > > problem still exsists > [@Michal](#): > > this situation Exactly what problem/situation are you talking about ? What’s working incorrectly ? If it’s a problem with the solver (not with the preprocessor), you should discuss it on the CalculiX forum. ---
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 18, 2023, 1:43pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/3 "2023-10-18T13:43:34Z")
I get memory error during solving when tie constraint become more coplex ( merged ) or exist big quantity of tie constraints also when I create compound parts I then have problems with constraints . Problem with simple linear static , similar problem was raported by me on much smaller model ( difference in results thread on formum arek2.pmx file ) best regards ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 18, 2023, 1:49pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/4 "2023-10-18T13:49:00Z")
> [@Michal](#): > > I get memory error during solving Then it’s definitely a question for the CalculiX forum. Maybe even directly for the dev - Guido Dhondt but it’s better to discuss it on the forum first. I assume that you are using Pardiso, not the default solver and that you can’t further simplify the model to use less constraints (it’s best to just merge parts in CAD software whenever possible). ---
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 18, 2023, 1:51pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/5 "2023-10-18T13:51:40Z")
by the way according to similar problem ( there was problem with difference in results but was caused by invalid constraints ) best regards ---
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 18, 2023, 1:54pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/6 "2023-10-18T13:54:07Z")
when new solver 2,21 version with pardiso will be aviable on TU Kielce ? best regards ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 18, 2023, 2:04pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/7 "2023-10-18T14:04:03Z")
> [@Michal](#): > > when new solver 2,21 version with pardiso will be aviable on TU Kielce ? You can try using the ccx\_dynamic file from [http://www.dhondt.de/calculix\_2.21\_4win.zip](http://www.dhondt.de/calculix_2.21_4win.zip) with the libraries from [https://staff.tu.kielce.pl/rokach/instr/misc/ccx\_220.7z](https://staff.tu.kielce.pl/rokach/instr/misc/ccx_220.7z) It should work. ---
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 18, 2023, 2:52pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/8 "2023-10-18T14:52:45Z")
first link is not active/valid ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 18, 2023, 3:01pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/9 "2023-10-18T15:01:51Z")
Try copying it and pasting to a new browser window/card. It’s a link directly to the package with ccx 2.21. ---
**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\ **Post date:** [October 18, 2023, 5:28pm UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/10 "2023-10-18T17:28:15Z")
Hi Michal, Have you compute the first 6 free modes as we comment last day? Could you post the file? Ideally as step. No BC or loads are needed. Regards. ---
**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\ **Post date:** [October 19, 2023, 6:55am UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/11 "2023-10-19T06:55:39Z")
I can not send - company policy ---
**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\ **Post date:** [October 19, 2023, 7:31am UTC](https://prepomax.discourse.group/t/tie-constraints-in-linear-static-basic-calculations/1191/12 "2023-10-19T07:31:03Z")
How could we help you? Have you compute the first 6 free modes as we comment last day to see contacts performance? ¿Do you know how to do that? Search for Strain energy hot spots arround your contact areas. ¿What’s the result?