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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.
nozzle.JPG
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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Alexander
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physics of that flow is not steady.
residuals oscillating is essential here.

you may reduce residuals simulating in transient
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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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