Why does the inlet boundary condition change? -- CFD Online Discussion Forums

October 9, 2015, 17:27	Why does the inlet boundary condition change?	#1
Ema40 Senior Member Join Date: Oct 2014 Posts: 124 Rep Power: 12	Hi, I am simulating an open channel flow and as inlet I impose a mass flow inlet, or velocity inlet, with depth 0.7 m and velocity 0.2 m/s, very slow. But after some time steps, the water depth at the inlet becomes smaller, from 0.7 m to 0.2 m more or less. Do you know why? The first obstacle is 6 m downstream the inlet, so very far away and the inlet should not be affected by this... Thank you Last edited by Ema40; October 9, 2015 at 17:28. Reason: missing something

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