Momentum source / porous loss
Hi all,
I am modelling a radiator and want to account for the pressure loss across it. I have data of pressure loss vs velocity. From that data and the depth of the radiator, I worked out my linear and quadratic resistance coefficients. I then set up a test case to see if the CFX model gave me sensible results. I set up a tunnel with the radiator in the middle and a velocity inlet of 10m/s. I used free slip walls. The pressure drop from CFX was 266 Pa and it should be 230. Can anyone please suggest why the two are different? Thanks, ijk |
Have you tried the CFX Catalytic Converter tutorial? That deals with flow through a porous medium and could assist in setting up your model.
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Got it solved.
It was a bug in Excel - I plotted a polynomial trendline in excel and the coefficients it gave me were wrong. |
calculation?
I'm trying to do the same thing - I have pressure drop vs. flow rate across a filter, and I need to include this loss in my CFX model. Can you share the spreadsheet or at least point me to the equations?
Thanks! Greg |
I modelled the flow through a radiator so in my case the flow can only go in one direction. Therefore I used the directional loss model.
I simply plotted (pressure drop/depth of radiator) vs. velocity and fitted a second order polynomial to the data points. (this was the problem in excel) The coefficients are the linear and quadratic resistance coefficients. |
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