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Diodicity measurement or diference in preasures

65 Views, 3 Replies
02/06/2018 6:42 PM

I want to measure pressure difference of forward and reverse flow direction in a tesla valve. If I set inlet velocity and outlet velocity as boundry conditions I get a result that says that the forward pressure drop is greater than the reverse preasure drop. And if I set preassures as boundry conditions i get a greater velocity in the reverse direction even tho it should vice versa


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Re: Diodicity measurement or diference in preasures

02/07/2018 1:47 AM

Hi @henri.hegedus,

 

Thanks for reaching out to us on the forums! I've never modeled a tesla valve before, but a couple of things do come to mind. You mention you set the inlet velocity and outlet velocity as boundary conditions. If there is only 1 inlet and outlet, and you are setting a flow rate (directly or via velocity BC), then the model is over constrained. In CFD you should always have at least 1 pressure boundary conditions. Flow rate and pressure BC pair, or pressure and pressure are both acceptable. 

 

Thanks, 



Matt Bemis

Technical Support Specialist


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Re: Diodicity measurement or diference in preasures

02/07/2018 5:40 AM
Thanks @matt.bemis. If I set pressure as a boundry condition I have the same problem the reverse flow pressure delta is smaller than the forward flow pressure delta

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