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September 14, 2004, 13:26 |
HVAC meshing with ICEM 4.cfx
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#1 |
Guest
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Dear Users,
Does anyone have experience using Tetra ICEM 4.cfx to build a mesh for internal air flow in buildings? I am working on a model of an operating theatre. I am not sure if the mesh I have constructed is appropriate. What parameters are important for an adequate model? Tetra Settings: Domain Size – 3m x 6m x 3m Global Mesh Size: 0.16 m Surface Mesh Size: Walls: 0.16m – 0.08m Inlet/Outlet: 0.065 – 0.025m Prism Settings: Growth Law: exp Initial Height: 15mm Height Ratio: 1.2 Number of Layers: 5 From experimental data the velocity range is from 0.1 to 0.4 m/s. What parameters are important for an adequate model? Is the mesh density ok? Are the prism setting ok for the walls? What range of y+ values is required? Best Regards Gearóid Lydon |
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September 14, 2004, 18:10 |
Re: HVAC meshing with ICEM 4.cfx
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#2 |
Guest
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Hi,
You have to determine whether the mesh is adequate yourself by performing a mesh independance study. The mesh required varies job to job. What type of model are you trying to do? Steady state or transient? RANS or DES/LES? These factors will also affect your required mesh. Glenn Horrocks |
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September 15, 2004, 05:11 |
Re: HVAC meshing with ICEM 4.cfx
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#3 |
Guest
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Hi Glenn,
The model is Steady State using the k-w model. For the mesh independence study, I should increase the mesh density until there are no changes in results? Are the y+ values relevant? If the model is changed to transient, will the mesh have to be less dense? Best Regards Gearóid Lydon |
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September 15, 2004, 18:16 |
Re: HVAC meshing with ICEM 4.cfx
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#4 |
Guest
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Hi,
The basic concept of a mesh independance check is you increase the mesh density until there are no changes in results. The y+ values are relevant. If you use the default wall functions then there is no real y+ limit, just what gives you a mesh independant solution - however you will probably want y+ to be less than 1 if you want really good accuracy for seperations. The required mesh is probably the same for transient and steady state, but computing resources usually mean you have to run a coarser mesh in transient as the computing time gets pretty long. Glenn |
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September 16, 2004, 06:40 |
Re: HVAC meshing with ICEM 4.cfx
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#5 |
Guest
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Hi Glenn,
Thanks for your help. Gearóid |
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