Need assistance in BC's for simulation of Vacuum cleaning nozzle
Hello All
I am simulating vacuum cleaning nozzle (only half model) with density at inlet 25 degree Celsius, 70 litre/s fluid flow and outlet Pressure boundary.! Here is my problem setup, MESH: Generated mesh in SnappyHexMesh-1.5.x 2.4 million cells 0/U: .... inlet { type flowRateInletVelocity; flowRate 0.07; value uniform (0 0 0); } outlet { type pressureInletOutletVelocity; value uniform (0 0 0); } symmetry { type symmetryPlane; } 0/p: .... outlet { type fixedValue; value uniform 0; } inlet { type zeroGradient; } symmetry { type symmetryPlane; } But for some reason U & p getting exploding after 5-10 iterations. PS: -I have 1.5mm gap between the floor and the vacuum cleaning nozzle, is that the reason? -Based on the outlet boundary area, i calculated the outlet velocity it comes to around 100m/s, is that realistic? is that the reason for divergence? it could be more near the nozzles and floor!!! -I am using kEpsilon turbulence model with inlet k=0.0026 & epsilon=0.0002 Can anybody suggest me what is wrong, with the simulation. I will be glad to provide all information if necessary. Thanks & kind Regards |
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