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BCs for bifurcated pipe

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Old   March 23, 2014, 10:53
Talking BCs for bifurcated pipe
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Liam
Join Date: Aug 2013
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Many is on a distinguished road
Hi Foamers,

I am having some convergence problems with a pipe simulation. The pipe has one inlet and two outlets (itīs more like a complicated channel than a pipe).

I want to compare simulations in laminar and compresible/incompressible regime in steady state with simpleFoam and rhoSimpleFoam.

About the BCs, I know the pressure at inlet and outlets, so I set:

0/U

inlet: inletOutlet
outlet1ressureInletOutletVelocity
outlet12ressureInletOutletVelocity
wall:fixedValue

0/p

inlet:totalPressure
outlet1:fixedValue
outlet2:fixedValue
wall:zeroGradient

The initial values are (0,0,0) for U and the outlet value for the initialization of p.

I have tried several meshes (checkMesh OK) created with snappyHexMesh, and the solution diverges (residuals donīt fall down with iterations).

Itīs weird, because if I do the simulation with two inlets and one outlet (and if I use the BCs for inlets and outlet explanied before) itīs converging.

Anybody can help me with the setup of BCs?

THanks!!

Many
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