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Difficulties with setup of interFOAM VOF - Boundary Conditions? |
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April 13, 2018, 07:05 |
Difficulties with setup of interFOAM VOF - Boundary Conditions?
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#1 |
New Member
Dave
Join Date: Aug 2016
Posts: 23
Rep Power: 9 |
Hi all,
I've been trying to simulate water & air flow past a yacht in a domain with an initialed volume of fluid, as illustrated below. However, when I simulate this I get peculiar behavior at the inlet patch, wherein the water seems to climb the boundaries of the domain in the opposite direction of fluid flow, as shown below. I've taken the yacht out of the simulation in an effort to speed up simulation times while I rectify this. I've tried altering patch types, positions (i.e. the air inlet/outlet being the top surface opposed to the side surfaces), differing flow velocities, and initializing the volume of fluid with a uniform velocity matching the inlet boundary condition. All of my simulation iterations seem to demonstrate the same behavior. Is anyone able to offer any suggestions on how to correct this? I've attached my case below for your reference. https://drive.google.com/open?id=1hF...KbXubSQNJMM3a_ Thanks and best regards domainSetup.png problem.jpg |
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April 13, 2018, 11:19 |
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#2 |
Senior Member
Taher Chegini
Join Date: Nov 2014
Location: Houston, Texas
Posts: 125
Rep Power: 12 |
BCs are wrong. I would suggest you to take a look at the wave tutorial of OF, here.
Moreover, there is no need breakup all the domain like the way you did. If you don't want to use the wave BC you might want to divide the inlet only not outlet and sides. Also, because you're using interFoam you should use fixedFluxPressure instead of zeroGradient for pressure and pressureInletOutLetVelocity for velocity for the boundaries where you use totalPressure for pressure. The general idea is that in this kind of problems you should specify velocity at the inlet (fixedValue for velocity and fixedFluxPressure for pressure) and pressure at the outlet (totalPressure for pressure and pressureInletOutLetVelocity for velocity). |
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May 6, 2018, 09:12 |
fixedFluxPressure
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#3 | |
New Member
Srikar Reddy Palla
Join Date: May 2018
Posts: 19
Rep Power: 8 |
Quote:
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