Modelling the Restitution-Coefficients including the Weber-Number

Deranda · December 10, 2015, 04:16

Hello,

I try to model wall impigments in a lagrangian multiphase flow. So I defined a fieldfunction for my normal- , tangential restitution coefficients and the Weber-Number.

Weber-Number: ${TrackParticleDensity}*pow($${TrackParticleVeloci ty}.mag()*sin(${TrackParticleIncidenceAngle}),2)*$ {TrackParticleDiameter}/0.035

Normal-Restitution (${WeberNumber} < 1.31) ? 1 : (1.1 * pow(${WeberNumber},-0.36))

Tangential-Restitution ($${TrackParticleVelocity}.mag()*cos(${TrackPartic leIncidenceAngle}) < 0.11) ? 0 : 0.862-0.094/($${TrackParticleVelocity}.mag()*cos(${TrackPartic leIncidenceAngle}))

I have already selected the TrackFile with: Particle.Diameter, Particle.Density, Particle.Velocity (Incidence Angle is not allowed)

Boundary Sampling: Particle.Density, Particle.Diameter, Particle.IncidenceAngle, Particle.Velocity

When I run the simulation, the following error message occurs: Unable to compute field function TangentialRestitution on parcels of Lagrangian Phase: Phase1. Please check that function is defined here.

So far so good: Now I have tried to select the incidence angle on my TrackFile, because this is the missing parameter for my field function (even if the incidence angle needs something like a boundary to interact...) like I expected the following error occurs: Function "Particle Incidence Angle" is not available to the TrackFile model in Lagrangian phase "Physics1: Phase1"

By the way, I can display those fieldfunctions in a scalarscene on a boundary which is selected for the boundary sampling. But they are not defined on my Lagragian Phase.

How can I solve this problem? Are there any existing approaches? Thank you for your support!

Nils

Deranda · December 11, 2015, 09:05

The problem has been solved.

It sounds simple:

Weber-Number:
${ParticleDensity}*pow($${ParticleVeloci ty}.mag()*sin(${ParticleIncidenceAngle}),2)*$ {ParticleDiameter}/0.035

Normal-Restitution:
(${WeberNumber} < 1.31) ? 1 : (1.1 * pow(${WeberNumber},-0.36))

Tangential-Restitution: ($${ParticleVelocity}.mag()*cos(${ParticleIncidenc eAngle}) < 0.11) ? 0 : 0.862-0.094/($${ParticleVelocity}.mag()*cos(${ParticleIncidenc eAngle}))

gives the right coefficients.
I thought that I necessarily have to use the Track-Parameters, because the IncidenceAngle is defined as an interaction between my LagrangianPhase and the boundary...

however, using the normal particle paramaters work quiet well.

December 10, 2015, 04:16	Modelling the Restitution-Coefficients including the Weber-Number	#1
Deranda Member Nils Join Date: Nov 2015 Posts: 59 Rep Power: 10	Hello, I try to model wall impigments in a lagrangian multiphase flow. So I defined a fieldfunction for my normal- , tangential restitution coefficients and the Weber-Number. Weber-Number: ${TrackParticleDensity}pow($${TrackParticleVeloci ty}.mag()sin(${TrackParticleIncidenceAngle}),2)$ {TrackParticleDiameter}/0.035 Normal-Restitution (${WeberNumber} < 1.31) ? 1 : (1.1 pow(${WeberNumber},-0.36)) Tangential-Restitution ($${TrackParticleVelocity}.mag()cos(${TrackPartic leIncidenceAngle}) < 0.11) ? 0 : 0.862-0.094/($${TrackParticleVelocity}.mag()cos(${TrackPartic leIncidenceAngle})) I have already selected the TrackFile with: Particle.Diameter, Particle.Density, Particle.Velocity (Incidence Angle is not allowed) Boundary Sampling: Particle.Density, Particle.Diameter, Particle.IncidenceAngle, Particle.Velocity When I run the simulation, the following error message occurs: Unable to compute field function TangentialRestitution on parcels of Lagrangian Phase: Phase1. Please check that function is defined here. So far so good: Now I have tried to select the incidence angle on my TrackFile, because this is the missing parameter for my field function (even if the incidence angle needs something like a boundary to interact...) like I expected the following error occurs: Function "Particle Incidence Angle" is not available to the TrackFile model in Lagrangian phase "Physics1: Phase1" By the way, I can display those fieldfunctions in a scalarscene on a boundary which is selected for the boundary sampling. But they are not defined on my Lagragian Phase. How can I solve this problem? Are there any existing approaches? Thank you for your support! Nils

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December 11, 2015, 09:05		#2
Deranda Member Nils Join Date: Nov 2015 Posts: 59 Rep Power: 10	The problem has been solved. It sounds simple: Weber-Number: ${ParticleDensity}pow($${ParticleVeloci ty}.mag()sin(${ParticleIncidenceAngle}),2)$ {ParticleDiameter}/0.035 Normal-Restitution: (${WeberNumber} < 1.31) ? 1 : (1.1 pow(${WeberNumber},-0.36)) Tangential-Restitution: ($${ParticleVelocity}.mag()cos(${ParticleIncidenc eAngle}) < 0.11) ? 0 : 0.862-0.094/($${ParticleVelocity}.mag()cos(${ParticleIncidenc eAngle})) gives the right coefficients. I thought that I necessarily have to use the Track-Parameters, because the IncidenceAngle is defined as an interaction between my LagrangianPhase and the boundary... however, using the normal particle paramaters work quiet well.