# CALCULIX material definition

**URL:** <https://precice.discourse.group/t/calculix-material-definition/846>\
**Category:** Non-preCICE\
**Tags:** openfoam, calculix\
**Created:** [December 27, 2021, 7:52am UTC](https://precice.discourse.group/t/calculix-material-definition/846 "2021-12-27T07:52:39Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![huchunjiao](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/huchunjiao/32/1056_2.png) [@huchunjiao](https://precice.discourse.group/u/huchunjiao)\
**Post date:** [December 27, 2021, 7:52am UTC](https://precice.discourse.group/t/calculix-material-definition/846/1 "2021-12-27T07:52:39Z")

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Hello, I am now using calculix-openfoam for fluid structure coupling simulation. In ANSYS software, it can not work normally due to excessive deformation. But the deformation in precice is so small. I guess it’s my material definition, but I don’t know how to modify it. The length unit is m

[fluid-openfoam.zip](https://precice.discourse.group/uploads/short-url/qMEEw95sW22BDnFbPpTNdWVYN7s.zip) (2.3 MB)  
[precice-Calculix-watchpoint-Flap-Tip.log](https://precice.discourse.group/uploads/short-url/cSe0nF2ZUbdCwIHMoI0JxIafj5E.log) (192.2 KB)

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**Author:** ![huchunjiao](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/huchunjiao/32/1056_2.png) [@huchunjiao](https://precice.discourse.group/u/huchunjiao)\
**Post date:** [December 27, 2021, 7:53am UTC](https://precice.discourse.group/t/calculix-material-definition/846/2 "2021-12-27T07:53:26Z")

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this is the inp file  
[tube.inp](https://precice.discourse.group/uploads/short-url/gizI78Sr4mDlohcCPOUZIAqojJr.inp) (411 Bytes)

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**Author:** ![uekerman](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/uekerman/32/2199_2.png) [@uekerman](https://precice.discourse.group/u/uekerman)\
**Post date:** [December 30, 2021, 10:16am UTC](https://precice.discourse.group/t/calculix-material-definition/846/3 "2021-12-30T10:16:26Z")

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Hi @huchunjiao 👋

You can change the solid material in the inp file:

```
*MATERIAL, Name=EL
*ELASTIC
2.3E+11, 0.2
*DENSITY
1400

```

It is indeed pretty stiff.

Benjamin

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<div class="post-metadata">

**Author:** ![huchunjiao](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/huchunjiao/32/1056_2.png) [@huchunjiao](https://precice.discourse.group/u/huchunjiao)\
**Post date:** [January 1, 2022, 5:48am UTC](https://precice.discourse.group/t/calculix-material-definition/846/4 "2022-01-01T05:48:55Z")

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I’m glad to receive your reply. My grid unit is in meter. My material density is 1420 kg/m3 and my Young’s modulus is 2.3E+11pa. How should I input it in the inp file? I’m not clear about the material unit in the inp file. Please help me

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**Author:** ![uekerman](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/uekerman/32/2199_2.png) [@uekerman](https://precice.discourse.group/u/uekerman)\
**Post date:** [January 2, 2022, 5:01pm UTC](https://precice.discourse.group/t/calculix-material-definition/846/6 "2022-01-02T17:01:53Z")

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Then, this looks correct.  
I guess you also double-checked the fluid parameters?

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**Author:** ![huchunjiao](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/huchunjiao/32/1056_2.png) [@huchunjiao](https://precice.discourse.group/u/huchunjiao)\
**Post date:** [January 3, 2022, 10:21am UTC](https://precice.discourse.group/t/calculix-material-definition/846/7 "2022-01-03T10:21:02Z")

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My model moves in the sea water. The sea water density is 1020kg / m3 and the model sailing speed is 0.5m/s. This is my parameter setting. What else do I need to change  
[parameter.zip](https://precice.discourse.group/uploads/short-url/zpTujyAoKHJ2v3dCI6AOgplnCZp.zip) (823 Bytes)

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<div class="post-metadata">

**Author:** ![huchunjiao](https://yyz2.discourse-cdn.com/free1/user_avatar/precice.discourse.group/huchunjiao/32/1056_2.png) [@huchunjiao](https://precice.discourse.group/u/huchunjiao)\
**Post date:** [January 3, 2022, 1:22pm UTC](https://precice.discourse.group/t/calculix-material-definition/846/8 "2022-01-03T13:22:05Z")

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The turbulence parameters in the boundary conditions are calculated according to this website（ [CFD Online - Turbulence Properties, Conversions & Boundary Estimations (cfd-online.com)](https://www.cfd-online.com/Tools/turbulence.php)）  
[0.zip](https://precice.discourse.group/uploads/short-url/pjsPgfrb3FLi5QutsRdryytOYHF.zip) (2.6 KB)