## Forum Replies Created

Viewing 15 posts - 1 through 15 (of 445 total)
• Author
Posts
• #5811
mathias
Keymaster

LBM is a second order scheme, i.e. the numerical solution will approach the analytical one up to an numerical error. Best Mathias

#5809
mathias
Keymaster

Standard bounce back in general work like this with the wall assumed to be located 1/2 off the nodes. In the mentioned example we have show how to realize it. Best Mathias

#5756
mathias
Keymaster

Dear jrfriggo,

You may consider taking part in our next spring school, where we explain how to set up a geometry step by step. It is hard to see what your problem here is.. Basically, in OpenLB you set up a geometry by indicator functions which can be given by stl files or geoetry primitives like cylinders, cubes, spheres, etc.

Best
Mathias

mathias
Keymaster

It scales the desity to e.g. physical units while the computation always uses lattice units where who is scaled to rho.

in reply to: Two component lattice density setting #5726
mathias
Keymaster

Dear Gloriousface,

my team helped you to get a basic version running. Finxing stability issues by means of our forum, however, is more that we can do.

Best
Mathias

in reply to: Flow boiling #5723
mathias
Keymaster

I have no idea about that topic? Which equation system do you want to solve?

in reply to: Velocity boundary conditions #5678
mathias
Keymaster

You can see that in our multi-component examples. Best Mathias

in reply to: Velocity boundary conditions #5676
mathias
Keymaster

it is basically there ot distigish betwwen bounce back boundaries (0.5) and other (1.0).

in reply to: Velocity boundary conditions #5674
mathias
Keymaster

Using a pressure boundary means fixing the density which is not a good idea if you are interested in the density evolutions. You should set a convetion boundary condition instead, which is a Neuman condition for density and velocity!

in reply to: Velocity boundary conditions #5672
mathias
Keymaster

You can do, yes.

in reply to: Multiphase Methods #5662
mathias
Keymaster

Yes, we do have a fre engery model implemented. Have a look at our examples. Best Mathias

in reply to: Fluid solid interaction #5641
mathias
Keymaster

If you refer to the OpenLB examples, that is a Free Energy Model and not SC. BEst Mathias

#5628
mathias
Keymaster

Dear Manash,

You need to write a new method which starts the reagion growing for any point within an idicator, lets say asphere, which intersections with a particular material number, e.g. 2, to start the algirthm. But keep in mind that you need to program the parallel region growing algorithm first. Within a colaboration we could help you further but that needs some efford.

Best
Mathias

#5620
mathias
Keymaster

Dear Manash,

you can work with intersections of geometry primitives (indicators) like cylinders, cuboids, etc. with the actualy generated voxel mesh by and stl-file or you may extend the region growing apporach (https://www.openlb.net/DoxyGen/html/d3/d2a/classolb_1_1BlockGeometryStructure3D.html#aa1a30cd27881b163d0486556769fcc70) to the superGeometry implementation, which is only available for blockGeometries at the momenent.

Best
Mathias

#5614
mathias
Keymaster

In allof the OpenLB examples a file “geometry” is written as vtk file, which you can be used for it.

Viewing 15 posts - 1 through 15 (of 445 total)