Turbulent flow over flat plate
My problem is a turbulent flow over flat plate. i have umomentum equation and continuity equation. vmomentum equation is neglected by using order of magnitudes. no pressure difference in xdirection because of potential flow. i have defined wall boundary and inflow boundary in xdir and top flow boundary in ydir. outflow boundary in xdir is not defined. i am using finite volume method. at the wall u velocity is calculated at yplus=30 by using loglaw. for log law shear stress at wall is calculated by meot*du/dy where meot is turb viscosity which is calculated by mixing length model. mixing length model is also used for modelling terms in u momentum eqn. The problem is after many iterations the distance from wall calculated from yplus crosses the first grid. please help me.

Re: Turbulent flow over flat plate
If I may seek some clarification:
How many equations are you solving: 1 (u) or 2 (u plus something else  y perhaps?)? Are you fixing the mass flow and iterating for wall stress, viceversa or something else? I am not sure I fully understand the last sentence (the problem). Are you fixing the grid line at the wall to y+ = 30 and the next grid line away from the wall has a y+ < 30? 
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