June 22, 2019 at 11:33 amvidyadhar.kpmSubscriber
I have done post processing of fluent case and data in "Paraview". I have done a basic operation using "clip" to remove certain cells.
I can export the data from paraview in any of the below types:
Comma separated (OR) Tab Delimited files (.csv, .tsv, .txt)
Exodus II file (.e, .exz, .exzv2, exo, .exo II, .exoii, .g, .gen)
VTK MultiBlock (.vtm)
xdmf Data File (.xmf)
xdmf 3 Data File (.xmf)
My question: I want to do meshing and naming of the surfaces in ANSYS from the domain obtained in any of the above formats from Paraview.
I am trying ICEM which reads .cgns format.
I request suggestions on any other better way.
Thanks in advance!
June 24, 2019 at 8:08 amDrAmineAnsys Employee
You have already one way.
But why are you doing that?
June 24, 2019 at 9:22 amRobAnsys Employee
Can you export VRML format (post processing)?
June 24, 2019 at 9:37 amvidyadhar.kpmSubscriber
I have done VOF simulation to obtain a static interface between a liquid and vapor. Now I want to perform Evaporation from the interface. I have written an UDF for that.
A) I am modelling (i) the evaporation mass loss as a negative source term in the liquid cells near the interface and ii) evaporation heat loss by way of applying a heat transfer coefficient. To apply heat transfer coefficient, I have to delete vapor cells above the interface and make the interface as a WALL. Since, I can not delete cells by iso-surface of VOF=0.5 in Fluent, I am deleting the vapor cells in Paraview and trying to export the residual domain back to meshing software.
If I retain vapor cells and apply the source terms both in liquid and vapor cells along with an energy source term in the liquid cells: The interface moves since liquid evaporates and also I am unable to validate my results.
Thanks & Regards,
June 24, 2019 at 9:38 amvidyadhar.kpmSubscriber
I can export in VRML format. But, I think paraview gives images in VRML format. I need to check this again.
Thanks & Regards,
June 24, 2019 at 11:03 amDrAmineAnsys Employee
Still mot getting why you want to remove the cells in Fluent: are the vapor cells upsetting you? Or is it a challenge? That is normal that the interface would move: that is a dynamic response: mass transfer across the interphase is difference between interfacial normal velocity and phase normal velocity..
I guess you can export to STL the model from the Fluent (if you are able to separate the fluid zones) and use that as input in pre-processor. Same task can be done in CFD-Post
June 26, 2019 at 10:35 amvidyadhar.kpmSubscriber
I am interested in maintaining static interface under evaporation conditions. I am applying mass source/sink terms in liquid/vapor cells and energy source in liquid cells in the region where 0
If I chose large time step, the solution diverges giving floating point exception. Also, the interface moves quickly.
If I chose small time step (~1e-10 s) such that I get convergence in each time step, even after running for a large number of time steps, I do not see constancy/steadiness in the average interfacial temperature.
I am using the following parameters:
VOF parameters: Explicit Formulation with default Courant number of 0.25; Implicit Body Force formulation.
Liquid phase is water and Vapor phase is water-vapor. I am using PISO, Geo-Reconstruct, GreenGauss Node based for gradient discretization; PRESTO! for pressure;Third Order MUSCL for momentum and Energy discretization. First order Implicit Transient formulation.
UnderRelaxationParameters: 0.25 for pressure and momentum; and default for others.
I request your suggestions to speed up my solution.
Thanks & Regards,
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