[xyq916]

Hi! Everybody
I want to get the mass erosion rate of pipe. The mass erosion rae is defined as the mass loss of pipe per unit mass of impacting particles.
Mass erosion rate=change in mass of wall(pipe)/mass of impacting particles units: [mg/g]
In CFX-Post, how to define an additional variable or expression to get it?
Thanks!

[highorder_cfd]

Hi

Not sure about what you are looking for, but
if you run a simulation using an erosion model under output variables, for particles, you should be able to find particle.Erosion Rate Density [kg/s/m^2] and this should be a (qualitative!) index of the erosion. I suppose that from the Erosion Rate Density available in CFX you should be able to get your variable.
See also in the Theory Guide the Section 6.4.3 Overall Erosion Rate and Erosion Output.

Cheers

[xyq916]

Originally Posted by highorder_cfd

Hi

Not sure about what you are looking for, but
if you run a simulation using an erosion model under output variables, for particles, you should be able to find particle.Erosion Rate Density [kg/s/m^2] and this should be a (qualitative!) index of the erosion. I suppose that from the Erosion Rate Density available in CFX you should be able to get your variable.
See also in the Theory Guide the Section 6.4.3 Overall Erosion Rate and Erosion Output.

Cheers

Thanks! Yes, I can find particle.Erosion Rate Density. Actually, I have tried to use particle.Erosion Rate Density [kg/s/m^2] divided by particle.Wall Mass Flow Density [kg/s/m^2] to define an additional variable(Mass erosion rate). But then I find the value of "particle.Wall Mass Flow" is zero on the whole wall. Do you know the other ways? How to caculate the mass of particle impact on wall per unit area and per unit time?

[highorder_cfd]

If I well remember, the particle mass flow rate impacting on a wall can be obtained using the massflow function for the particles over a named selection.