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April 3, 2015, 06:15 |
CFD_external aero problems
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#1 |
New Member
Argyris Apost
Join Date: Nov 2014
Posts: 7
Rep Power: 11 |
Hi everyone,
i am new to ANSA and i am interested in making a CFD study of a simple car. In order to correctly predict separation regions i am using K-w SST model. For this to work i choose y+ 11 so the first height is 0.25mm. But when i create the layers all the cells of the road violate the aspect ratio criterion, even when i make it 100, and non orthogonality. Surface mesh of the car: min 5mm max 20mm Windtunnel: 5mm-300mm Sizebox_around_car: max surf:30 max vol:30 Sizebox_wake:max surf:40 max vol:40 I've tried many things such as making different layers for the road with first height cell 2.5mm but then i had skewed elements between the layers of the car and that of the road. I 'm interested in a 6-8 million cell mesh. Any advice about how to solve these problems and what are the best sizing for the mesh would be helpful. Thanks in advance, Argyris |
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