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Compressible flow through a duct

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Old   June 30, 2020, 04:55
Default Compressible flow through a duct
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ishan
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I want to simulate compressible subsonic flow through a duct. What I am essentially trying to do is replicate an experimental setup.

The setup is shown in this image: https://ibb.co/WHmcx3V

The solver I intend to use is rhoSimpleFoam in OF7 for compressible steady state flow with SST k-omega model. The target Y+ is 1.

I am stuck at three issues:

1)I am confused about the boundary conditions at the start of the entrance section(section 1). Should I make use of pressureInletVelocity or totalPressure ? The reference literature I have, mentions it as ďambientĒ boundary condition with no reference to any specific solver. This makes me wonder, should I use a freestream ? That said, at the outlet I am using flowRateOutletVelocity.

2) What initial turbulence quantities should I use at the inlet and outlet of the setup? Since I donít have the setup inlet velocity, I cannot calculate the turbulence quantities.

3)How should I proceed with the calculation of the first layer height for Y+ as I donít have any inlet velocity values.

Can someone please point me to the right direction ?
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