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residual vibration in nozzle and diffuser simulation

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Old   January 21, 2022, 03:20
Default residual vibration in nozzle and diffuser simulation
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joomi lee
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A nozzle and diffuser simulation are in progress.
residual is vibrate.
residual vibration.JPG

I'm using the k-w SST turbulence model, Courant number 0.7 and pressure-inlet condition.

what is wrong??
and how to fix it??

help me..... :-(
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Old   January 21, 2022, 04:06
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AlexanderZ will become famous soon enoughAlexanderZ will become famous soon enough
physics of that flow is not steady.
residuals oscillating is essential here.

you may reduce residuals simulating in transient
best regards

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Old   January 21, 2022, 14:05
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Lorenzo Galieti
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Yes, personal experience, to converge this nozzle flow you need to run the unsteady solver.

You didn't make any blatant mistake so far
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diffuser, fluent, nozzle, residual, vibration

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