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How to set deltaT in controlDict?

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Old   June 12, 2019, 10:31
Default How to set deltaT in controlDict?
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Raza Javed
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Hello Everyone,


I have a question related to deltaT in controlDict.



What things do I need to consider while choosing the deltaT? I am running my simulation, there is a fluid flow in my case, and velocity of fluid is in range of 1e-3 m/s to 1.5 m/s. but my residuals for velocity are not getting down.



I exactly don't know but could it be also because of my deltaT because solver seems to be working, but the velocity residuals are very high (between 0.003 to 0.01).


Do I need to set deltaT by keeping in mind my velocity of fluid?


I shall be very thankful if someone can help me out in this.


Thank you
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