Is it possible to define non-constant restitution coefficients at wall boundaries, or a varying mass flow absorption coefficient?
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A Particle User Routine is needed to define non-constant restitution coefficients. An example (Restitution.F ) is attached to this solution. In this example, the argument is the particle velocity. If the particle velocity is greater than 10 [m/s], the particle restitution coefficients will be set to 1 so that particles will bounce back from the wall; otherwise, the particle restitution coefficients is set to zero, so that particles will stick to the wall. If it is desired to specify a non-constant mass flow absorption coefficient a similar Particle User FORTRAN can be used. For that purpose, an example (Absorption.F) is also attached to this solution. In this example, the argument is still the particle velocity. If the particle velocity is greater than 10 [m/s], mass flow absorption coefficient will be 0, so that there will be no absorption at the wall; otherwise; mass flow absorption coefficient will be 1.0, so that particles are absorbed. |
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