laminar flow with heat transfer
Hi everyone,
I have been trying simulate laminar flow with a constant heat flux through a cylindrical pipe. I have tried using buoyantBoussinesqSimpleFoam, buoyantBoussinesqPimpleFoam and even icoFoam with chnages in code. The buoyantSimple case is not converging and the other two cases are also not giving correct answers. I have used bc T- fixedGradient along wall to incorporate heat flux thing.... Can anyone suggest why the results are not coming correct?? Please, I am stuck with this one for two weeks....I need help.. Thanks in advance.... |
what is your fluid?
why dont you use bouyantSimpleFoam? |
Hi nimasam,
My fluid is water, incompressible case. Also, I need to take into account gravity also. The solver which you are suggesting works for compressible fluids? |
yes, it almost use for compressible fluid, but it can be used for incompressible fluid too ;), if you choose apropriate thermoPhydicalDict
However you choose some how suitable solvers, would you please, share your results in different solvers, and make much more declare why results are not correct |
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It has worked and I have got similar profiles but the magnitude is not correct. Like the maximum average velocity should have been 0.002 but it is coming out to be 0.0015 & similarly the expected temperature ranges were 307-338 but it is giving 301-334. I have checked the bc's. It looks correct to me. So, why it is so? |
its damn close ;), maybe you need to play with ur numerical schemes forexample using second order schemes or refine your mesh
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Hello good foamers,
I'm a new beginner in openfoam. I need to ask 2 questions. A)I'd like to solve a laminar channel flow in 2D. I'll use air as the working fluid and will use constant heat flux in one boundary. I tried to use buoyantBousinesqSimpleFoam but can't figure out how to arrange case files. Here is what I tried; 1) In RASProperties, I choose turbulence off and laminar as model. I deleted every variables in 0 folder except than p_rgh and copied the p,T,U files from my_icoFoam applications. 2) I used the same BCs for p_rgh as given in the iglooWithFridges tutorial by rearranging them to the geometry which I used. 3) The rest is the same with iglooWithFridges tutorial. I ran blockMesh without error. When I type buoyantBousinesqSimpleFoam in the terminal an error occurs concerning alphat. So how can I overcome this problem? B) Is there any standard solver to solve this problem transient? Kind Regards. Umut |
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Dear nimasam;
Thank you for your reply, your suggestion worked just fine. I also found that buoyantBousinesqPimpleFoam works for transient flows. Kind regards, Umut |
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