code_saturne User's Forum

I was trying full developed laminar profile at inlet Boundary condtion by using this expression
U= Umax. (1- (x^2+y^2)/R^2)
so i define at Inlet BC user profile above expression
dir_x = 0;
dir_y = 0;
dir_z = 10*(1-(x^2+y^2)/0.1^2);

where Umax. = 10 , but after simulation complted at inlet BC profile is not coming correct. data experted by postprocessing

Hello,

Could you please be more precise (following forum usage recommendations would help) ?
How large is the difference between the expected profile and the obtained profile ? We can't provide you relevant answers by just guessing.

We already have a (user subroutine-based) possibility for fully developed inlets, which should work well if your mesh is orthogonal at the inlet (always the case if it includes at least 1 layer built by extrusion). You can find it in the code's user subroutine examples (EXAMPLES in a given case's SRC/).

Regards,

Yvan