Particle Impact Velocity
 

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.

Thanks,
Batis

? 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.

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.

Thanks,
Batis

You would have to look up the erosion model in the documentation and then chase up the references for the erosion model.

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.

Thanks,
Batis

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.

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.

Thanks,
Batis

Impact velocity magnitude and direction
 

I want to know that how can we calculate the magnitude and direction of impact velocity using Lagrangian particle motion equation.

Why do you add a new question to such an old query? next time: please open a new one...



Nevertheless, the first thing that comes to my mind is that I would:
- open my case in Pre
- Go to Output Control/Export

- Create a "Export Result"
- Set: "Output Boundary" to the boundary on which you want to examine the particle impact
- Set: "Output Variables List" to the components of the 3 Particle Velocities

Thanks for ur help.


Kindly, can u explain the theoretical procedure in evaluating the magnitude and direction of impact velocity?

No. I cannot explain this. Please look in the literature, or wait for someone else to reply.