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Old   August 31, 2010, 12:19
Default Particle Impact Velocity
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Przemek
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Hi,

does anyone know, how exactly the Particle Impact Velocity is evaluated? I would like to know, if the Restitution Coefficient has any influence on this evaluation.

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Old   August 31, 2010, 18:22
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? It is simply the velocity at which the particle strikes the wall. Restitution coeff has no affect on it as it only affects the velocity at which the particle leaves the wall.
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Old   August 31, 2010, 19:06
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Thanks for reply.

So I was thinking, but I've made some particle erosion parameter study and my results show that Erosion Rate increases with decrease of Perpendicullar Restitution Coeff. I was wondering what was the reason and its influence on impact velocity came to my mind.

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Old   September 1, 2010, 20:00
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You would have to look up the erosion model in the documentation and then chase up the references for the erosion model.
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Old   September 1, 2010, 23:21
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I know the formulation of erosion model very well, and I've also read several references. The only variables affecting the erosion ratio (in Finnie erosion model) are: impact velocity and impact angle.

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Old   September 2, 2010, 18:44
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That answers your question, doesn't it?

Keep in mind that the particle might strike the surface several times, and the restitution coefficient will affect these bounces.
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Old   September 4, 2010, 08:23
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Yes, probably this is the reason. But what is interesting, the distribution of Erosion Rate Density on walls surface is almost the same for all cases, only the value differs for different Rest. Coeff. values.

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