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looknimei木蟲 (小有名氣)
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[求助]
LES網(wǎng)格劃分要求,求解答。。
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FLUENT中對于LES近壁區(qū)處理如下: When the mesh is fine enough to resolve the laminar sublayer, the wall shear stress is obtained from the laminar stress-strain relationship: u+=y+ If the mesh is too coarse to resolve the laminar sublayer, it is assumed that the centroid of the wall-adjacent cell falls within the logarithmic region of the boundary layer, and the law-of-the-wall is employed。 是否可以認(rèn)為FLUENT當(dāng)y+<=5時,采用u+=y+;當(dāng)y+>5時,假定單元中心點在對數(shù)區(qū)內(nèi),從而采用壁面率? 現(xiàn)在面臨困境:若要y+<=1,網(wǎng)格數(shù)太高(3000萬左右),工作站計算太慢,目前的在計算的網(wǎng)格y+在10左右,按上面所述FLUENT應(yīng)該是采用壁面率吧?但是壁面率比較準(zhǔn)確的范圍應(yīng)該在y+>=30吧?那我現(xiàn)在可否把網(wǎng)格調(diào)整到y(tǒng)+>=30? |
木蟲 (小有名氣)
木蟲 (小有名氣)
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