how to solve negative volume?
I am trying to simulate 2d vortex vibration of cylinder.
I just made simple 2d domain which have inlet, symmetry (top and bottom), outlet and just wall ( large domain subtracts cylinder).
Then, I imposed an udf file on cylinder to move vertical motion in dynamic option.
I have searched all of google sites about same problems but I cannot solve my problem.
In dynamic mesh, cylinder has rigid body with udf file.
1 turn on smoothing with spring constant factor 0 and boundary node relaxation 1.
2. turn on remeshing option with sizing funtion and use defaults of parameters.
I know I have something wrong in my steps but I have no idea what is wrong with.
I appreciate your guys leave any comments or any ideas.
Increase spring constant.
Additionally, check it in display->grid; I think in newer versions, there is an option to view motion of specific parts not all of them if you faced this in solve->grid motion.
I have a weird moving mesh (attached file)
I assigned osc to cylinder and osc_inert to the entire fluid region (this part is in udf file)
I assigned the top and bottom walls as stationary.
But, the mesh wend out beyond top /bottom walls.
Do you have any idea for this problem?
I'm not sure that understand your problem clearly, but there are few comments on such dynamic mesh issues:
- your elements are quadratic, so you have to enable moving them in smoothing method in TUI. (refer to manual)
- your cylinder oscillate in y-direction, so the only thing you need is to hook DEFINE_CG_MOTION on cylinder boundary and let fluent to change other cells with smoothing method; (fluid zone doesn't need any UDF).
Thanks, My problem looks like solved.
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