# Non-uniform Boundary Conditions

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 June 16, 2014, 18:11 #21 New Member   zahra Join Date: Jun 2014 Location: Iran-Tehran Posts: 28 Rep Power: 3 Hello, I am new to openFoam and C++ .I want to use codedFixedValue for a wall with convection boundary condition. for this boundary i have used energy balance and with convection BC i have found following equation. Ts= c1*(c2* Ta+Ti ) In this equation Ts is the temperature of the boundary and Ta is the ambient temperature and Ti is the internal adjacent cell temperature(internal adjacent cell which is next to the boundary) and c1 and c2 are constant. now i do not know how i can find Ti and how i should define it here in codedFixedValue . and i should know normal distance between internal adjacent cell center and the boundary, how should i do this?

 September 8, 2015, 07:41 #22 New Member   Tomladian Bucinara Join Date: Jan 2015 Posts: 17 Rep Power: 3 Hello ajnewman, I found these replies may provide a solution for the problem that I am struggling with, but I need your help as I am inexperienced in C++. The non uniform inlet boundary condition for my problem could not be expressed in a mathmatical fomula, but only listed in a excel table that provides the coordinates and the corresponding velocity components. It is something like below: x y z ux uy uz 1 0 0 0.1 0.6 0.8 2.5 0.1 0 0.1 0.5 2 3 0.2 0 0.2 0.7 2.8 ... The first three components tells location (z component is 0 for this surface) and the remaining three components are the velocity components. I do not know how to apply the data to the inlet boundary condition. Any help would be greatly appreciated. Tom

 October 5, 2015, 03:31 timeVaryingMappedFixedValue #23 Member   Divyaprakash Join Date: Jun 2014 Posts: 30 Rep Power: 3 Why can't we use timeVaryingMappedFixedValue here? Although I am not too sure what does interpolation in time mean here.

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