InterFOAM Question

GardenLake · April 29, 2024, 14:49

Hello,

I have an open channel flow occurring. I have air above my water and have 2 inlets (1 for air and 1 for water). I have both set to a value.

When I view my alpha (phase indicator) it seems that there is a bump in my water and then the domains slowly fills up with water even though it is suppose to keep flowing downstream out of domain. Does anyone know what the issue with this issue?

I would post screenshots but it says I am forbidden to do attachments for some unknown reason.

wkernkamp · April 29, 2024, 15:58

Your inflow might be fine, but your outflow is not working.

GardenLake · April 29, 2024, 16:10

I have the pressure specified at the top =0. My outlet is zeroGradient for velocity, alpha (phase indicator), and pressure. My inlet is set to a value for velocity, alpha=1, and pressure = fixedFluxPressure.

Do these seem reasonable? Anything in the outlet that I should adjust?

Thank you

wkernkamp · April 30, 2024, 00:52

It is a bit late so I might not be of much use. Will look closer tomorrow. Could you try with a fixed pressure condition at the inlet?

GardenLake · April 30, 2024, 12:44

The issue with setting a fixed pressure at the inlet is that I am using P instead of pgh which would make no hydrostatic pressure at the inlet which is incorrect. The set velocity should increase pressure in that region and direct flow down to the outlet correct?

wkernkamp · April 30, 2024, 18:11

You are not the only one experiencing some issues: Strange Hydrostatic Boundary Backflow with interFoam.

That person did not get an answer, even though he presents more information.

A helpful tutorials case might be this: "tutorials/multiphase/interFoam/RAS/damBreak/damBreak". From what you have written so far, it seems to me that this case (or it's laminar cousing) can be modified to match your domain.

April 29, 2024, 14:49	InterFOAM Question	#1
GardenLake New Member Michael Join Date: Mar 2024 Posts: 8 Rep Power: 2	Hello, I have an open channel flow occurring. I have air above my water and have 2 inlets (1 for air and 1 for water). I have both set to a value. When I view my alpha (phase indicator) it seems that there is a bump in my water and then the domains slowly fills up with water even though it is suppose to keep flowing downstream out of domain. Does anyone know what the issue with this issue? I would post screenshots but it says I am forbidden to do attachments for some unknown reason.

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April 29, 2024, 15:58		#2
wkernkamp Senior Member Will Kernkamp Join Date: Jun 2014 Posts: 338 Rep Power: 12	Your inflow might be fine, but your outflow is not working.

April 29, 2024, 16:10		#3
GardenLake New Member Michael Join Date: Mar 2024 Posts: 8 Rep Power: 2	I have the pressure specified at the top =0. My outlet is zeroGradient for velocity, alpha (phase indicator), and pressure. My inlet is set to a value for velocity, alpha=1, and pressure = fixedFluxPressure. Do these seem reasonable? Anything in the outlet that I should adjust? Thank you

April 30, 2024, 00:52		#4
wkernkamp Senior Member Will Kernkamp Join Date: Jun 2014 Posts: 338 Rep Power: 12	It is a bit late so I might not be of much use. Will look closer tomorrow. Could you try with a fixed pressure condition at the inlet?

April 30, 2024, 12:44		#5
GardenLake New Member Michael Join Date: Mar 2024 Posts: 8 Rep Power: 2	The issue with setting a fixed pressure at the inlet is that I am using P instead of pgh which would make no hydrostatic pressure at the inlet which is incorrect. The set velocity should increase pressure in that region and direct flow down to the outlet correct?

April 30, 2024, 18:11		#6
wkernkamp Senior Member Will Kernkamp Join Date: Jun 2014 Posts: 338 Rep Power: 12	You are not the only one experiencing some issues: Strange Hydrostatic Boundary Backflow with interFoam. That person did not get an answer, even though he presents more information. A helpful tutorials case might be this: "tutorials/multiphase/interFoam/RAS/damBreak/damBreak". From what you have written so far, it seems to me that this case (or it's laminar cousing) can be modified to match your domain.