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-   -   [GAMBIT] Questions about 2D dynamic meshing (https://www.cfd-online.com/Forums/ansys-meshing/146834-questions-about-2d-dynamic-meshing.html)

turbo_agni January 7, 2015 17:47

Questions about 2D dynamic meshing
 
1 Attachment(s)
I am an undergrad student and am new to CFD softwares. I need to simulate a simple case in which there is a small oscilating solid block inside a rectangular domain (Please refer to the picture below). I am using GAMBIT 2.4 for geometry and meshing and FLUENT 6.3 for simulation.

Attachment 36390

I know that dynamic meshing needs to be done.

I have the following questions.:confused:

1) While meshing in GAMBIT, do I need to do something different for dynamic meshing or can I just use the standard Triangular mesh?

2) In FLUENT, do I need to specify both "rigid body" for the block and "deforming" for the interior or just one would do?

Thanks in advance

-mAx- January 8, 2015 04:12

you have 3 ways for dynamic mesh in Fluent (understand that remeshing will occure in Fluent, not in Gambit)
*Smoothing --> Cell Stretching (Tri)
*Remeshing --> local Remeshung (Tri)
*Layering --> add and suppress quad layers (Quad)

The BC will depend on the type of dynamic mesh you will choose

turbo_agni January 10, 2015 00:05

I tried for a linear translation of a block in a rectangular domain.
1) I used a triangular mesh
2) I defined the following UDF

#include "udf.h"

DEFINE_CG_MOTION(Test_case, dt, vel, omega, time, dtime)
{
real ampl, w, pi;

/* reset velocities */
NV_S (vel, =, 0.0);
NV_S (omega, =, 0.0);

/* define object movement law */
vel[0] = 0.08;
vel[1] = 0;
vel[2] = 0;
}

3) Compiled without error in fluent and defined the block as rigid body and default interior as deforming.
4) The block is moving but the mesh is not deforming or moving

HELP!!

http://www.cfd-online.com/Forums/C:\...p\Capture1.png

-mAx- January 12, 2015 02:32

display and explain what you did and set.

acasas January 12, 2015 06:28

Quote:

Originally Posted by turbo_agni (Post 526821)

3) Compiled without error in fluent and defined the block as rigid body and default interior as deforming.

Donīt define the default interior as deforming. It should work.

Please, could you visit my threads and see if you could help me too?

http://www.cfd-online.com/Forums/ans...eed-valve.html

http://www.cfd-online.com/Forums/flu...g-useless.html

Thanks and good luck


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