2D Venturimeter Analysis Problems
Hi guys,
I have a problem to model the flow of water through a ventuimeter using ANSYS WORKBENCH 14; FLUENT, however I am a bit of a beginner and am having some problems setting up my solutions. I had set up the analysis as 2D, and modelled the top half of the geometry (the line of symmetry is set up as an axis in the set-up) and created a bias in the mesh towards the venturi throat. In my set up I use the k-epsilon model as the flow is turbulent and have enhanced wall treatment enabled. The fluid is water and is defined as such, and enters the pipe at a velocity of 4.77 m/s as defined in ANSYS. The inlet is set as a velocity inlet, centreline as an axis, wall as a wall and outlet as a pressure outlet. However when I run my calculation the solution does not converge and I am continually faced with being told that the flow is reversed? Any help at all on how to successfully setup my problem and obtain solutions would be kindly received. Cheers |
Hi!
Did you elongate the outlet to avoid backflow? |
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Perfect! Good luck and keep us updated!
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Yep. The flow probably detaches at the venturi's wall. This creates a backflow that difficults the convergence.
Since this is probably your case, you may want to check the k omega sst model, instead of the k epsilon ewt. In models with detached flow like venturis, it may underpredict the pressure losses. But i'm new also in this, so dont trust me much :) |
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