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Courant no. unstable

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Old   December 10, 2022, 06:03
Exclamation Courant no. unstable
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Rishi Kumar
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Hi everyone,
I am trying to run a fluid flow simulation in an artery using pimple Foam.
But the courant number is increasing abruptly.

Earlier when i tried the same for simple tube it run perfectly with stable Courant No.

Please help me to stablize the courant no. so that my simulation can converge.
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Old   December 19, 2022, 11:01
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Josh Williams
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I guess the artery has some curvature near the outlets which causes backflow issues. You may wish to change your BCs to a robust one that cancels backflow (I think totalPressure and inletOutlet do this).

Difficult to help without info such as your BCs, y+, any turbulence model etc..
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