How can I maintain a constant volume during the simulation period?

bejewel · January 20, 2011, 07:45

Boundary Conditions:
Xmin:wave
Xmax: outflow
front ,back & bottom:wall
top: outflow

How can I maintain a constant volume during the simulation period?

MuxaB · January 20, 2011, 12:26

Quote:

Originally Posted by bejewel

Boundary Conditions:
Xmin:wave
Xmax: outflow
front ,back & bottom:wall
top: outflow

How can I maintain a constant volume during the simulation period?

Not easy. The degree of conservation depends on mesh resolution, VOF scheme used and velocity advection. Split Lagrangian VOF method may work better.

JBurnham · January 25, 2011, 11:40

To add to MuxaB's response, you can also make the domain long enough in the direction of wave propagation that the transit time required for three waves to reach the downstream outflow boundary is sufficient to find the results you need. The wave-propagation mass conservation issue at the outflow boundary usually takes three full wave fronts to start to significantly appear.

January 20, 2011, 07:45	How can I maintain a constant volume during the simulation period?	#1
bejewel New Member bejewel Join Date: Jan 2011 Posts: 3 Rep Power: 15	Boundary Conditions: Xmin:wave Xmax: outflow front ,back & bottom:wall top: outflow How can I maintain a constant volume during the simulation period?

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January 25, 2011, 11:40		#3
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	To add to MuxaB's response, you can also make the domain long enough in the direction of wave propagation that the transit time required for three waves to reach the downstream outflow boundary is sufficient to find the results you need. The wave-propagation mass conservation issue at the outflow boundary usually takes three full wave fronts to start to significantly appear.