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September 9, 2024 at 7:41 am
Nick Fan
SubscriberHello,
I used the Discrete Phase Model to simulate the trajectories of PM2.5 in indoor space, the volume injection is used to set 40,000 particles uniformly distributed in indoor space, and an air conditioner and an air purifier are used to dilute the particles inside the room. I use the RANS equations and the RNG k-ϵ turbulence model, with an explicit time integration method. I would like to ask what is the recommended range for the Courant number when setting it?Â
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September 9, 2024 at 12:20 pm
Federico
Ansys EmployeeBest practices for explicit time integration would recommended to have a Courant number less or equal to 1.0 for accuracy and stability of the solution.
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September 10, 2024 at 1:26 am
Nick Fan
SubscriberThank you for your reply, Federico.I apologize for the mistake in the initial conditions. Actually, I am using an implicit solver, not an explicit one. Could you please advise on the recommended range for the Courant number when using an implicit method?
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September 10, 2024 at 11:56 am
Federico
Ansys EmployeeThe implicit solver is more flexible with Courant number and is generally more stable. Still, a Courant number closer to 1 will yield most accurate solution with better resolution of transient effects.
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September 13, 2024 at 5:51 am
Nick Fan
SubscriberThank you for your valuable feedback, Federico.
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