Hello Everyone,

i have modeled a 10'' and 14'' single plate check valve(please see Image and 3d PDF ) and want to perform Flow Simulation the following data ate available with me,

1)Inlet Volume flow rate 850m3/hr for 10'' valve and 1530 m3/hr for 14'' valve.

2)Inlet Pressure 10bar.

Now i want to find,

1) the pressure drop across the inlet and outlet and it should not exceed above 0.5 bar.

2) Velocity of fluid.

3)Force and torque acting on disk at different closing angle (from 0-55 degree) also for different mass flow rate

I have try the simulation but the mass flow rate is

coming negative in outlet side when check with surface parameters( I've set inlet at .236 m3/s(850 m3/hr) outlet condition at 9.5 bar pressure) also the Pressure drop is different for different flow rate.(due to continuity equation,may be).

Can any one guide me how to actually find the pressure drop and why the negative mass flow rate is coming at outlet.

*Any help on this problem would be greatly appreciated! Thank you in advance!*

1. Increase the straight pipe sections. Each one should be at least five diameters long. If you can't afford the increased cell count then set your inlet as fully developed and only increase the length of the outlet. This should help eliminate vortices at your BCs.

2. The negative sign on your flow rate at the outlet means that mass is exiting the domain, that's the sign convention for control volumes.

3. The pressure will build up directly upstream of your valve, this is where you should probe the flow to determine your pressure drop.

4. The velocity of the flow will vary, I'm not sure where you want to know it. You can probe cut plots or use the XY Plots tool to get specific velocity magnitudes at any point in your domain.

5. Of course pressure drop will vary with flow rate, the faster you move your fluid through this valve the greater your friction and drag losses will be.