In a square cavity, i can simulate hot left and cold right wall(nusselt number validated), but hot bottom wall and cold top wall doesn't work. if anyone have code with validated nusselt number can send me the code, it will be really great. i can find some codes on line. but they are only qualitatively correct. I have checked palabos and openlb. But, i want to modify the code for my own purpose, so i need an independent stand alone code. Thanks a lot.
Use this forum it cam help you. Good luck.
https://www.cfd-online.com/
in your program, just change the force in the other direction... in your D2Q9 or other...
so instead of changing your boundary condition, you can modify the force buoyancy rho x g to make it general with gcos(alpha) and g x sin (alpha) where alpha is the tilted angle.
your RB proble will be for alpha =90°
the validation could be acjieved with the critical Ray from dif to convective of Rac = 1707.
several papers are avialable see Ben hamed Haykel or others semma el alami or ...
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Thanks a lot for your help. I am looking for a sample code because i have already coded RB convection in matlab. But, somehow nuselt number is not working out. so, i am stuck here for months. I am trying to find a sample code to see where i am going wrong.
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