Very high or negative pressures -- CFD Online Discussion Forums

July 23, 2009, 16:42	Very high or negative pressures	#1
jpo Member Join Date: Apr 2009 Posts: 94 Rep Power: 17	Dear All, I am modeling a pipe with dynamic mesh. One end is a piston, the other end is an outlet/outflow. Case setup: k-epsilon incompressible: air density = 2.33 kg/m^3 = constant. Operating pressure = 265kPa at piston; also tried 0 Pa. I tried the open pipe end as outlet as well as outflow. The first step of the motion ends always with wrong static pressures. Next to piston they are very high (>1E+6). If the open end is an outflow, then the pressure there becomes negative. Please help me correct the errors in this case.

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