# B.C. for turbulent mixing layers

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 March 29, 2000, 16:06 B.C. for turbulent mixing layers #1 Jason Guest   Posts: n/a Hello everyone, I am now working on the numerical modelling of plane mixing layers using SIMPLE code, my computation domain is of a rectangular shape, for inlet, experimental data is used, and the Neumann condition is applied for outlet, how can I give the B.C. for the other two entrainment boundries(the boundry which parallel the main flow direction)? thanks.

 March 29, 2000, 16:55 Re: B.C. for turbulent mixing layers #2 John C. Chien Guest   Posts: n/a (1).In the two stream mixing case, you can specify the outer boundaries as free stream boundaries. That is the same as the inlet boundary conditions away from the mixing plane. (2). I don't use the code you mentioned, so you need to check the code the available boundary conditions. Normally, there will be inlet, outlet, wall, far-field boundary conditions. (2). A moving wall at the inlet velocity is also all right to use. But remember to check the effect on the flow field after the solution is obtained. In principle, the boundary conditions should be placed far away from the area of interest. So, it is important to move the outer boundary away from the mixing plane to check the effect.

 May 12, 2000, 13:34 Re: B.C. for turbulent mixing layers #3 C.U.D Guest   Posts: n/a (1)Inflow B.C :Velocity "U" used 'Tanh' profile (fixed) Velocity "v" used 'Random perturbation'(eigenfunction)& superimposed to the mean flow Density "D" Obtained from D*U=CONST Pressure "p" used"Upwind"or called "One side differenced" Given value on "Guard cell"(Because downstream effects)

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