water channel flow with non symmetrical solution
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)
inlet: 100e3 (kinematic pressure, but actuall pressure is 100e6 = 100MPa)
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.
I want to add how my simulation looks after some time.
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