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Characteristic mesh size in DDES simulation

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Old   May 27, 2021, 01:44
Default Characteristic mesh size in DDES simulation
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Mattia Samiolo
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Good morning everyone,

I would want your opinion to build the correct mesh around a car, in my case I will use a k-omega SST DDES. I am aware that the measure of the mesh in the boundary condition has to start with a y+ value around 1 because of the SST model, but my concerns arise when the code switch to LES. What calculations or mind path do you use to estimate the mesh in the free stream?

As suggested by (Howard and Pourquie), the recommended mesh size in the detached flow regions for a DES-type simulation should be close to the Taylor microscale given by λ = 15^(1/2) A^( -1/2) Re^(-1/2)L, where A is an undetermined constant set to be 0.5 in this paper, L is the bulk integral scale (taken as the vehicle length, L), and Re the Reynolds number

Howard and Pourquie paper:

Thank you
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ddes, mesh, wake

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