water channel flow with non symmetrical solution
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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. |
2 Attachment(s)
I want to add how my simulation looks after some time.
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