# Question about BC of pitzDaily

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 August 28, 2010, 13:10 Question about BC of pitzDaily #1 Senior Member     Join Date: Jan 2010 Posts: 347 Blog Entries: 2 Rep Power: 10 Dear Foamers, This is U from pisoFoam/les/pitzDaily/0: Code: ```/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 1.7.0 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type turbulentInlet; referenceField uniform (10 0 0); fluctuationScale (0.02 0.01 0.01); value uniform (10 0 0); } outlet { type inletOutlet; inletValue uniform (0 0 0); value uniform (0 0 0); } upperWall { type fixedValue; value uniform (0 0 0); } lowerWall { type fixedValue; value uniform (0 0 0); } frontAndBack { type empty; } }``` as it shows initial velocity is 0 for all domain. but, i can't understand boundary values for inlet and outlet of geometry: Code: ```inlet { type turbulentInlet; referenceField uniform (10 0 0); fluctuationScale (0.02 0.01 0.01); value uniform (10 0 0); } outlet { type inletOutlet; inletValue uniform (0 0 0); value uniform (0 0 0);``` why outlet value is zero and is it possible? what is difference between inletValue and value in outlet? what is the terms in inlet and their detail definition? Regards, Maysam