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### 3d beam interaction with fluid

Posted: **08 Apr 2013, 14:46**

by **armanini333**

the example shows the interaction of a linear elastic 3d beam in a fluid. Stress and displacements in the beam are calculated from the pressure of the fluid as load case on the beam. The grid is rude, but its just for fast calculation of this example

Small displacements are assumed (1. order elastic theory). No mesh update is done for this reason. The example is a full GUI example.

### Re: 3d beam interaction with fluid

Posted: **08 Apr 2013, 15:12**

by **armanini333**

The results are in the sign (where it is posititve it should be negative) inverted.

### Re: 3d beam interaction with fluid

Posted: **15 Jan 2014, 23:39**

by **Hal**

Thanks, this is really useful! Is there any chance you could post the .grd (or other meshing file) used in this test?

Thanks!

### Re: 3d beam interaction with fluid

Posted: **12 Feb 2015, 15:41**

by **crznelson**

good one

but i canĀ“t get it to converge:

ERROR:: IterSolve: Failed convergence tolerances.

ERROR:: ComputeChange: Norm of solution appears to be NaN

Is necessary to change "your default definitions" on the Setup or Iterations or tolerances to converge?

best regards

### Re: 3d beam interaction with fluid

Posted: **01 Feb 2018, 14:07**

by **skoushik**

Hi

I am running simple elasticity problem (to compare linear and nonlinear solutions). While using the nonlinear elasticity solver, I had the same issue :

ERROR:: IterSolve: Failed convergence tolerances.

ERROR:: ComputeChange: Norm of solution appears to be NaN

The output is still generated, but is wrong, as can be seen in the fig attached. Any guidance would be appreciated.

Thanks.