September 14, 2020 at 4:59 pmschwaralSubscriber
I wonder if this is one way to create the porous jump or should I do it in a different way?
September 15, 2020 at 3:18 pmUlrich SchmidtAnsys EmployeeI strongly recommend to use a conformal mesh where you want to assign a porous jump. I have never tested or seen a porous jump at a grid interface.nWith a conformal mesh the setup is straightforward, changing the right interior to type porous-jump, and you can visually check whether you have the right zone.nSeptember 15, 2020 at 5:03 pmschwaralSubscriberI did it like you recommended (picture here of my simple 3D case). However I face the problem, when I set for the porous jump conditions a thickness of 1mm the calculation diverges. When I use a thickness of 0,01mm the solution converges. C2 is in my case 0. Face permeability (= permeability I used in standard porous zone in my other setup) = 1e-11. Do you have any idea why the solver has a problem with the thickness lager then 0,01mm? my case is super simple here and for more complex 3D case I face the same problem. I dont think it is related to the mesh. nFor my 3D case I also receive these two errors when usin 1mm thickness (maybe they help). I could not really find something online that was helpfull.detecting divergent flow at 1D porous jump zone 3nReverse porous jump zone 3 orientation based on bulk flow directionnbest regards, AlexnSeptember 16, 2020 at 12:37 pmRobAnsys Employee1e-11 is a very small coefficient, but otherwise I can't see why it's not working. How does the flow look before it fails?nSeptember 16, 2020 at 1:49 pmschwaralSubscriberOkay I think I forgot to devide by the face thickness to convert the permeability from porous media to porous jump. So now my face permeability is a little bit reduced. Just to make sure, cell size at porous jump does not affect the stability in diffrent ways cell size usually affect the stability?nSeptember 16, 2020 at 3:35 pmRobAnsys EmployeeShouldn't have any more effect than usual assuming you're picking up the gradients etc that may or may not be associated with the pressure drop.Viewing 5 reply threads
- Splitted Geometry
- Mesh the geometry with one interface
- In fluent: interface --> (static, matched) --> change interior to porous jump condition. Here I wonder should I change all 4 or just one interior to porous jump?
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