How to define Boundary Conditions in heat Transfer ??
hi,
i want to make a research on natural convection, for that i have to use OpenFoam. As solver my plan is to use buoyantSimpleFoam or buoyantSimpleRadiationFoam (if you know a better solver please tell me ;-) ) My geometry is a cylinder (1m long, diameter 5cm) which has a temperature of 70°C, the room in which the the cylinder is have a temperature of 20 °C. I have the geometry edited in BlockMeshDict as 2-Dmodel, i also have the model in a 3-D model meshed by Netgen. The geometry you can see in the picture. I want to get by OpenFoam results for the velocity, i have measured in a test rig that the velocity is u = 0,05m/s to 0,25 m/s. My problem now is how i can define the boundary conditions. i donīt know which value alphat, epsilon, k, mut and omega from the buoyantSimpleFoam-tutorial should have? or which value alphat, epsilon, G, k, and mut from the buoyantSimpleRadiationFoam-tutorial should have? if i use the tutorials, and edit the temperature to 20°C and 70°C and the pressure to 1bar, i always get a Error message. Can somebody help me? thanks and greets almir http://s7.directupload.net/images/110716/tgs6oyqp.jpg |
hi
1) if u access to fluent documentation you can find how to calculate first approximation for k-epsilon or here : http://www.cfd-online.com/Forums/ope...lon-model.html 2) as i remember mut and alphat can be set calculated 3 ) buoyantSimpleRadiationFoam-tutorial : http://www.google.com/url?sa=t&sourc...zGzXIw&cad=rja |
hiiiiii
hi,
i want to make a project on openFoam. i solved cavity problem for isothermal flow now i want to go for nonisothermal problem for cavity laminar flow it means natural convection flow.so as solver what r the modification require in icoFoam solver. My problem now is how i can define the boundary conditions. i donīt know which value alphat, epsilon, k, mut and omega from the buoyantSimpleFoam-tutorial should have? so i m so confused Can somebody help me? thanks and greets jignesh |
Please post your questions not in multiple topics, that is confusing:
http://www.cfd-online.com/Forums/ope...onvection.html |
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