LPT incompressible fluid

Lighto · June 13, 2018, 08:42

Hi everyone,

I'm a new member of the community.
I'm struggling with OpenFOAM to implement a lagrangian particle tracking on an incompressible fluid (i.e. blood cells in blood). I've followed many tutorials online but any of them worked for me. How can I implement LPT in icoFoam? And how can I post-process particles' properties such as their velocity and inducted shear stress?
I'm using OpenFOAM 5.0 on OpenSuse 42.2.

Thanks a lot,
Lighto

guin · June 13, 2018, 19:53

I think that the closest to what you are looking for is the solver DPMFoam. Indeed it is more a 2-way (kinematic) coupling between pimpleFoam + lagrangian particles with option for particle collisions.

The post-processing is quite easy:
1. paraFoam (load all objects)
2. use extractBlock filter to select your particles
3. use glyph filter e.g as spheres, scaled by the diameter and map onto them whatever property available from the list

Regarding the shear stress, I don't think there is such a thing for the particles in OF-5.0. May you rather be looking for something as the "immersed boundary" method? You can find an implementation in the foam-extend version, but keep in mind that it will not work efficiently if you want to simulate many particles simultaneously.

Lighto · June 14, 2018, 07:57

Thank you for the advice. Basically DMPFoam can solve pressure and velocity fields for water and simultanaously inject particles that follow the fluid velocity, is it right? So what I have to do is to specify the properties of the fluid inside trasportProperties and turbulenceProperties.fluid and than replace rho.air, U.air ecc with rho.fluid, U.fluid ecc inside the directory 0/ and the file system/fvSolution?

EdgarRey · October 4, 2022, 20:58

i know it may be a little late

but i think this could help future readers that be starting (as me).

there is a very important parameter called stokes number which may tell you if you need to simulate the lagrangian particles or instead (in case the particles have very few mass) you could assume the particles are embed in the fluid so particles velocity is exactly the same as fluids.

if this last is your case you could make the simple simulation of the flow on OF and then apply the particle tracking filter on paraview.

June 13, 2018, 08:42	LPT incompressible fluid	#1
Lighto New Member Davide Join Date: Jun 2018 Posts: 10 Rep Power: 8	Hi everyone, I'm a new member of the community. I'm struggling with OpenFOAM to implement a lagrangian particle tracking on an incompressible fluid (i.e. blood cells in blood). I've followed many tutorials online but any of them worked for me. How can I implement LPT in icoFoam? And how can I post-process particles' properties such as their velocity and inducted shear stress? I'm using OpenFOAM 5.0 on OpenSuse 42.2. Thanks a lot, Lighto

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June 13, 2018, 19:53		#2
guin Member Rodrigo Join Date: Mar 2010 Posts: 98 Rep Power: 16	I think that the closest to what you are looking for is the solver DPMFoam. Indeed it is more a 2-way (kinematic) coupling between pimpleFoam + lagrangian particles with option for particle collisions. The post-processing is quite easy: 1. paraFoam (load all objects) 2. use extractBlock filter to select your particles 3. use glyph filter e.g as spheres, scaled by the diameter and map onto them whatever property available from the list Regarding the shear stress, I don't think there is such a thing for the particles in OF-5.0. May you rather be looking for something as the "immersed boundary" method? You can find an implementation in the foam-extend version, but keep in mind that it will not work efficiently if you want to simulate many particles simultaneously.

June 14, 2018, 07:57		#3
Lighto New Member Davide Join Date: Jun 2018 Posts: 10 Rep Power: 8	Thank you for the advice. Basically DMPFoam can solve pressure and velocity fields for water and simultanaously inject particles that follow the fluid velocity, is it right? So what I have to do is to specify the properties of the fluid inside trasportProperties and turbulenceProperties.fluid and than replace rho.air, U.air ecc with rho.fluid, U.fluid ecc inside the directory 0/ and the file system/fvSolution?

October 4, 2022, 20:58		#4
EdgarRey New Member Edgar Fernando Rey Torra Join Date: Aug 2022 Posts: 6 Rep Power: 4	i know it may be a little late but i think this could help future readers that be starting (as me). there is a very important parameter called stokes number which may tell you if you need to simulate the lagrangian particles or instead (in case the particles have very few mass) you could assume the particles are embed in the fluid so particles velocity is exactly the same as fluids. if this last is your case you could make the simple simulation of the flow on OF and then apply the particle tracking filter on paraview.