What is the diameter of the particles of the air for porous medium simulations in fluent?

Vikash Kumar Singh Chauhan @Vikash-Chauhan

18 October 2016 1 6K Report

the actual size of the air molecule is somewhere in range of e-10 whereas from the avogadro law ,one molecule occupies about 3.3e-9 m of length.but both of the dimensions provide erroneous results in the porous field simulation.

James Garry

Vikash,

What is the density of the air in the simulation?

If it is a very low density, then choosing a particle size comparable to an 'average' molecule (~50nm) is not wrong.

If you are trying to model viscous flows (high density, high Reynolds number), then this may not be the best approach.

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