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-   -   the result of the velocity and pressure drop is a little strange. (https://www.cfd-online.com/Forums/fluent/110719-result-velocity-pressure-drop-little-strange.html)

yuhehuan December 18, 2012 20:48

the result of the velocity and pressure drop is a little strange.
 
Hi, everyone. I simulated the airlow in a box(0.25m*0.02m*0.25m) using fluent, the velocity at inlet(the bottom surface of the box) is 0.05m/s, and got the pressre drop at outlet (top surface) is 6pa/0.25m, which is close to the value i calculated by using Ergun equation. But the problem is the facet average velocity at the inlet and outlet are aslo 0.05m/s. It seems the velocity doesn't reduce from the bottom to the top. Is it resonable? And if i used a circle (r=0.005m) as the inlet, the pressure drop is very low, like 0.1pa/0.25m. So i think the pressure drop is too small. Does anybody explain it for me? I will appreciate your reply! Many thanks!


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