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water channel flow with non symmetrical solution

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Old   October 21, 2011, 09:41
Default water channel flow with non symmetrical solution
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bruce
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Dear All,

I calculate "sudden" convergent-divergent nozzle flow using pimpleFoam solver (attached a case) Although the geometry is symmetric the outflow jet seems to explode and make non-symmetric solutions after some time.

The case is incompressible with water as medium. And the BC are,

nu = 1.0e-06 (kinematic visosity)

pressure:
inlet: 100e3 (kinematic pressure, but actuall pressure is 100e6 = 100MPa)
outlet: 0
wall: zeroGradient

Velocity U:
inlet: zeroGradient
outlet: zeroGradient
wall: zeroGradient

I actually test different BC like pressureInletVelocity for U and inletOutlet. And very fine grid. The non-symmetrical nature is still persist.

And, I have attached a complete case which is actually a coarse grid for fast calculation.

Since the pressure is driving the flow. Umax is around 480 m/s as the nozzle is so small.

Remark: the geometry is actually nearly same as cacitationFoam tutorial but i use pimpleFoam to solve water flow.

Could somebody help me to figure out why this happens?

Thanks for help.
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File Type: gz case.tar.gz (5.0 KB, 7 views)
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Old   October 21, 2011, 12:00
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bruce
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I want to add how my simulation looks after some time.
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File Type: jpg case2.jpg (17.8 KB, 27 views)
File Type: jpg case1.jpg (8.0 KB, 17 views)
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