Phase Change not Visible when Switching from Velocity Inlet to Pressure Inlet

bintang · February 20, 2024, 20:14

Hello everyone,

I am currently facing a challenge in simulating flow boiling using the Volume of Fluid (VOF) method in fluent. When I use the velocity inlet boundary condition, the simulation runs smoothly and successfully captures the phase change.

However, when I switch the boundary condition to pressure inlet, the phase change is not visible even though the pressure and temperature meet the conditions for phase change. I have ensured that simulation parameters and settings are correct.

I would like to ask for advice or guidance from all of you. Has anyone experienced a similar situation? Are there specific settings to be mindful of when using a pressure inlet for flow boiling simulation with VOF?

I truly appreciate any help or insights you can provide. Thank you very much!

[Bintang]

LuckyTran · February 20, 2024, 20:24

You need to specify the volume fraction at the inlet. Simply specifying temperature and pressure does not say anything about the phase of the material.

bintang · March 18, 2024, 05:37

Thank you, it's already working.

February 20, 2024, 20:14	Phase Change not Visible when Switching from Velocity Inlet to Pressure Inlet	#1
bintang New Member bintang fikri Join Date: Feb 2024 Posts: 5 Rep Power: 2	Hello everyone, I am currently facing a challenge in simulating flow boiling using the Volume of Fluid (VOF) method in fluent. When I use the velocity inlet boundary condition, the simulation runs smoothly and successfully captures the phase change. However, when I switch the boundary condition to pressure inlet, the phase change is not visible even though the pressure and temperature meet the conditions for phase change. I have ensured that simulation parameters and settings are correct. I would like to ask for advice or guidance from all of you. Has anyone experienced a similar situation? Are there specific settings to be mindful of when using a pressure inlet for flow boiling simulation with VOF? I truly appreciate any help or insights you can provide. Thank you very much! [Bintang]

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February 20, 2024, 20:24		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,704 Rep Power: 66	You need to specify the volume fraction at the inlet. Simply specifying temperature and pressure does not say anything about the phase of the material.

March 18, 2024, 05:37		#3
bintang New Member bintang fikri Join Date: Feb 2024 Posts: 5 Rep Power: 2	Thank you, it's already working.