Raise pressure level in simulation to avoid negative pressures -- CFD Online Discussion Forums

June 12, 2012, 17:38	Raise pressure level in simulation to avoid negative pressures	#1
solimcfd New Member Join Date: Jul 2010 Posts: 20 Rep Power: 15	Hi! I am doing some simulations of hydraulic spool valves to improve pressure drop and flow force characteristics. At small openings, I get negative pressure values, in some cases in excess of -1000 bar. To avoid this problem I increased the pressure of my outlet BC (actually an opening) to a much higher value, thereby ensuring that no negative pressures occur. My question is whether this is a valid method, by which I can compare the performance (pressure drop and flow forces) of various valve geometries. Or, is this incorrect?

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