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April 16, 2010, 07:03 |
modelling: high- and low re grids
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Join Date: Apr 2010
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Hi everyone,
I'm a student from Germany (so I'm sorry for my english and my frustratingly poor cfd-knowledge..) and I need some help concerning turbulent flow modelling: We made a model (stepflow) using k-omega / k-epsilon methods and high-re/low-re grids. As far as I know low-Re grids are for laminar boundary layers, where you are able to calculate the shape of the boundary layer and thats why you need a grid with small steps. Right? When you have a turbulent boundary layer you need an approximation for calculating the shape, such as the 1/7-"wandgesetz". You don't need such small steps because you use the Approximation and know the shape without calculating at several points. Am I right? Now, my question: what about the buffer layer, where you don't know whether the layer ist turbulent or not? Do you use a low-re grid and try to calculate it? But if its turbulent, how does that work? (we use FresCo) I hope you can help me, I'm a bit confused... |
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