|November 12, 2013, 05:50||
Fluent 6DOF TETRA Multibody
Join Date: Nov 2012
Posts: 6Rep Power: 5
I'm currently experiencing difficulties to achieve a 3D non-structured tetra simulation .
My aim is to simulate the ejection of 3 different solid parts from a cavity in a wall.
I'm using our in-house 6DOF model for each element, which are moving free in a tetrahedral domain (the 6DOF model is OK).
The begining of the simulation is quite satisfying, but after a few thousands time steps, some high and low pressure values appear in the domain , far from the bodies (so far from the expected physic changes).
After 2000 time steps theese high pressure zones starts to appear on the walls, and amplify by the time. I stopped my simulations at 5000 times steps (~0.3s) because the physic is not good anymore.
Theese "drops" are likely to appear near from the fixed walls.
I don't undestand what's happening, but it looks like something incremental for me.
Here I resume the characteristics of the simulation :
Fluent 13 3d
Pressure-based , unsteady
Variable time-step, but an average very low time-step (~0.00005 s !!)
Fluid : water
Boudary conditions :
velocity inlet on front face and flow inlet
pressure outlet on flow outlet
k-epsilon turb. model
Dynamic mesh smoothing, remeshing / Local Cell
Size remeshing interval : 1
Max cell skewness : 0.9
Each body : UDF 6DOF Rigid Body
Fixed walls (wall & cavity) : Dyn. Mesh Stationary
P-V coupling : SIMPLE
Spat. Discretization :
Gradient : Green-Gauss Cell Based
P : 2nd order
Momentum : 2nd order
k : 2nd order
epsilon : 2nd order
Time : 1st order implicit
P : 0.25
Density : 1
Body force, Mom., k , eps, turb. visc : 0.5
I don't see any other relevant characteristics...
Did some of you has ever experienced similar issues ?
Thanks by advance
|6dof, fluent, tetrahedral|
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