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Why negative pressure at inlet in backwardFacingStep2D tutorial? |
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May 5, 2022, 11:30 |
Why negative pressure at inlet in backwardFacingStep2D tutorial?
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#1 |
New Member
BH
Join Date: Dec 2021
Posts: 9
Rep Power: 4 |
Right out of the box, this tutorial simulates a negative inlet pressure
(inlet P/rho = -41 m^2/s^2, outlet P/rho is zero) though it forces a positive inlet velocity (44.2 m/s). Is this some problem with the turbulence model, or am I going crazy (this seems to defy conservation of energy)? I'm using openfoam2112. |
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May 6, 2022, 02:03 |
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#2 |
New Member
BH
Join Date: Dec 2021
Posts: 9
Rep Power: 4 |
Nevermind, my mistake. In short, this reverse pressure gradient is explained just
with Bernoulli's principle. As for energy, somewhere outside of the simulation (i.e., before the inlet), the pressure must be positive (i.e., greater than the outlet pressure) to have gotten the air moving at its high inlet speed. It all seems pretty obvious now. |
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backward facing step, turbulence |
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