How to add a sink term to the transport equation for the volume fraction

ASLAN_1987 · September 14, 2015, 10:46

As mentioned in a paper "An undesired phenomenon that is often observed in hull simulations is a thin layer of air in the first cell layers at the hull surface. This air layer, which affects the shear stresses on the hull, emerges from the region where the free surface hits the hull. It is not observed in experiments, and any air layer forming in the first cell layers at the hull should therefore be removed. In STAR-CCM+ a sink term was added to the transport equation for the volume fraction. The sink term was applied in the cells closest to the hull where the volume fraction of air was below 0.3.", I met the same problem and am new to STAR-CCM+. I want to know how to add a sink term to the transport equation for the volume fraction.
TX SO MUCH!

fluid23 · September 14, 2015, 11:33

I believe you will want to use a species source. Check out the help documentation and decide for yourself, but that sounds like where I would start if I were you.

(a sink is just a negative source)

ASLAN_1987 · September 14, 2015, 21:57

Quote:

Originally Posted by MBdonCFD

I believe you will want to use a species source. Check out the help documentation and decide for yourself, but that sounds like where I would start if I were you.

(a sink is just a negative source)

THANK you I have checked the manual, but i think i need check more.

September 14, 2015, 10:46	How to add a sink term to the transport equation for the volume fraction	#1
ASLAN_1987 New Member weilai Join Date: Sep 2015 Posts: 6 Rep Power: 10	As mentioned in a paper "An undesired phenomenon that is often observed in hull simulations is a thin layer of air in the first cell layers at the hull surface. This air layer, which affects the shear stresses on the hull, emerges from the region where the free surface hits the hull. It is not observed in experiments, and any air layer forming in the first cell layers at the hull should therefore be removed. In STAR-CCM+ a sink term was added to the transport equation for the volume fraction. The sink term was applied in the cells closest to the hull where the volume fraction of air was below 0.3.", I met the same problem and am new to STAR-CCM+. I want to know how to add a sink term to the transport equation for the volume fraction. TX SO MUCH!

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September 14, 2015, 11:33		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	I believe you will want to use a species source. Check out the help documentation and decide for yourself, but that sounds like where I would start if I were you. (a sink is just a negative source)