Validation of shear mixing layer using kwsst

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 September 9, 2003, 22:27 Validation of shear mixing layer using kwsst #1 Samuell Guest   Posts: n/a Sponsored Links Hello, We are doing a validation case on free mixing shear layer flow with your software using a 2d grid so it can be compared with Liepman and Laufer experimental results. There is a problem accourding the boundary conditions on the domain. the validation problem is using an input file with a function of U/Ustream = 0.5+(0.5*tanh10n), where 0.2>n>-0.3 at the inlet. the problem when this case is simulated is that there will be a reverse flow allways on the lower part pof the domain just after the inlet 0>n>-0.3. The boundary conditions used are symmetry on the top and bottom , velocity inlet at the inlet and outflow at the end of the domain. The problem used for the mixing shear layer is using a structured mesh. : The points used at the inlet are 101 points at the upper part and 151 at the : lower part. Accourding to my input file, it is showing me the right shape so i : dont think this is the problem. : : Let me explain you the shape of the domain. : It starts at the inlet with coordinates (1,0.2), (1,-0.3) and (10,2), : (10,-3)at the outlet : w : : q : i---------------------------c y=0 (along this line) : a : : b : : x=1 x=10 : : q and w are connected : a and b are connected : : the line qi have 101 point while ia have 151 points and since the mesh is : structrured the lines wc have the same points as qi and cb same as ia. : : on the three lines qw, ic and ab have 200 points each. : : the reverse flow starts at the lower surface just behind the line ia (just : some distance behind) : : the boundary conditions are set to be qw and ab symmerty : qi and ia velocity inlet (input profile) : and finaly wc and cb are pressure outlet. Best regards Samuell
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