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Capturing the onset of Convection for Rayleigh benard convection with openfoam |
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April 16, 2018, 10:27 |
Capturing the onset of Convection for Rayleigh benard convection with openfoam
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Join Date: Oct 2014
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I was trying to capture the critical Rayleigh number using Openfoam buoyantBoussinesqPimpleFoam?
However, I am unsuccessful to get the onset close to Ra_c= 1708; as one has to perturb the initial field with the correct scale. Openfoam gives the onset some were inbetween Ra = 3000 to 8000 when I dont apply any disturbances in my initial field. Also after setting fluctuations (described below) in the initial temperature field I am not getting correct Rayleigh numbers. I am starting with the linear conduction temperature profile and superimposing a sinosidal function as a disturbance as ----> 0.1*sin(pi*x)*sin(2*pi*y) .Here, (0.1) is the amplitude of the perturbation where 0.1 is dimensionless value (i.e., 10 % of T_h -T_c) I have tried 2d simulations for a wide aspect ratio case (5:1) with periodic boundary conditions in x-axis, with central differencing scemes for both convective and diffussive terms Experts please share your experience/suggesstion regarding this? Waiting for earliest positive response from anyone. Thanks in advance |
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buoyantpimplefoam, onset of convection, openfoam 4, rayleigh number, rayleigh-benard |
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