|
[Sponsors] |
November 12, 2013, 05:50 |
Fluent 6DOF TETRA Multibody
|
#1 |
New Member
Join Date: Nov 2012
Posts: 6
Rep Power: 14 |
Hi everybody
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 Tetrahedral mesh 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 Under-Relax. : 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 Benjamin |
|
Tags |
6dof, fluent, tetrahedral |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Two questions on Fluent UDF | Steven | Fluent UDF and Scheme Programming | 7 | March 23, 2018 04:22 |
heat transfer with RANS wall function, over a flat plate (validation with fluent) | bruce | OpenFOAM Running, Solving & CFD | 6 | January 20, 2017 07:22 |
Fluent 6.3 32bit vs Fluent 12.0 64bit | ibex7 | FLUENT | 7 | April 18, 2011 03:44 |
Fluent 12.0 is worst then Fluent 6.2 | herntan | FLUENT | 5 | December 14, 2009 03:57 |
Exporting ICEM Tetra Grid to Fluent with Hexa-Core | Tim | FLUENT | 2 | August 30, 2007 08:16 |