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How many particle tracks do I need for discrete particle tracking in CFD?

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infocfd:
Hi,

I am a beginner in multiphase simulation using Lagrangian approach. How do I know how many particles do I need to have a representative particle trajectory in the simulation? Does it depend on the mass flow of the particles? Does each particle represent its own mass of single particle or is it the total mass flow of the particles divided by the number of particle tracks?

Please help.

Many thanks.

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