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January 16, 2007, 19:04 |
What is the extrusion layer
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#1 |
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Hi..
I am trying to simulate turblent flow inside a duct. I generated the mesh using Proam. What exactly is the significance of the extrusion layer? is it just the surface mesh? Do I need to include it while specifying the boundary conditions. I am novice with star CD. Please bear with me if it is an obvious answer.. |
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January 16, 2007, 23:52 |
Re: What is the extrusion layer
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#2 |
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Hi, Extrusion layer is the boundary layer that you generate for the wall (if required) depending on your application. Hope this helps - Mac.
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January 17, 2007, 17:08 |
Re: What is the extrusion layer
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#3 |
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without extrusion layer your solution is really poor. It is not recommended to run a case without extrusion layer (except for fluent users )
ask your support office to explain you why with a picture. |
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February 1, 2007, 21:51 |
Re: What is the extrusion layer
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#4 |
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Hello !
The extrusion layer is one (or more) layer(s) of cells next to the wall. Let's say you have one layer... This layer has a thickness (which you specify) and this thickness is crucial for the y+ values in that region in a turbulent regime... This y+ value ideally should be between 30-100 (it works acceptable between 11-300) when you involve a high Re number k-e turbulence model. You have to be careful with this value especially when you compute heat transfer coefficients at the walls... |
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February 2, 2007, 01:02 |
Re: What is the extrusion layer
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#5 |
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Thanks !
I have another question. I simulated the model with a default extrusion wall layer thickness of 1. The model converged. How do I check the values of y+. Can I check from the post processing files? |
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February 2, 2007, 17:06 |
Re: What is the extrusion layer
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#6 |
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Yes, you can. But you have to make sure that you checked this:in analysis output panel there is a tab which shows some variables to be either posted or printed. Among those there is y+ values.., You have to check the "post" button for that value and run you simulation for 1 more iteration. The results pst file will contain the y+ value... You get it with the command: getw,yplu
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