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-   -   Temperature depending on x,y as boundary condition in Steady-state Thermal simulation (http://www.cfd-online.com/Forums/cfx/109910-temperature-depending-x-y-boundary-condition-steady-state-thermal-simulation.html)

 FluidCFD November 29, 2012 11:18

Temperature depending on x,y as boundary condition in Steady-state Thermal simulation

Hi,

I'd like to add a varying temperature distribution depending on the x and y direction as a boundary condition in a steady-state thermal simulation. When I add "Temperature" to the "Steady-State Thermal" folder in the "Setup" step I can only make it dependent from x or y, but not from both. Can anybody tell me whether it is possible to add a 2D temperature distribution? It should be something like T1-x^2-y^2.

Best regards

 cdegroot November 29, 2012 11:47

Yes using CEL this is possible.

 brunoc November 29, 2012 12:32

Quote:
 Originally Posted by FluidCFD (Post 394876) Hi, I'd like to add a varying temperature distribution depending on the x and y direction as a boundary condition in a steady-state thermal simulation. When I add "Temperature" to the "Steady-State Thermal" folder in the "Setup" step I can only make it dependent from x or y, but not from both. Can anybody tell me whether it is possible to add a 2D temperature distribution? It should be something like T1-x^2-y^2. Best regards
Seems like you're creating your model in Mechanical. This is the forum for CFX. You can do that simulation in CFX using a CEL Expression, as Chris mentioned, and it is quite straightforward.

 FluidCFD December 3, 2012 06:27

Hi,

thanks to you both. I first tried to do it in CFX and with the help of CEL, then had some other problems and thought, Steady-state Thermal is designed to do exactly what I want to do. Apparently, it is easier to implement in CFX than in Thermal analysis. I got it running now.

Another question: When I want to know the heat flux at an arbitrary plane, is the one displayed normal to that plane?

Best regards

 cdegroot December 3, 2012 10:38

Glad you got it running. I'm not sure I understand your current question. If you define a plane, the heat flux reported will be the heat flux through that plane.

 FluidCFD December 3, 2012 11:12

Yeah, that was my question. Can you also tell me what the difference between heat flux and wall heat flux is, as the heat flux is often "not defined" and I don't understand why.

 brunoc December 3, 2012 12:01

Heat fluxes come from the solver, they're not calculated by CFD-Post, and I think the results file don't include that field. You can calculate it yourself, though. Just create one variable that calculates the temperature gradient, and another one that does the rest of the calculation (heat flux by conduction, advection, etc).

Cheers

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