Moving wall not working in multiphaseEulerFoam
 

Hi FOAMers,


I have asked a part of question in below thread
https://www.cfd-online.com/Forums/op...ification.html



Now, I tested following in V10 and ran into issue. It is a very simple task: either there is some fundamental bug in multiphaseEulerFoam solver or I'm making a silly mistake. Perhaps, you can point me in right direction.

A fluidizedBed setup is copied from ../multiphase/multiphaseEulerFoam/RAS/fluidizedBed tutorial folder of V10. Please see Figure (1) in attached image.

All settings are exactly same and only changes are (a) Four sides along X, Z axes are modeled as walls (in original setup, patches along X are modeled as “empty” with one cell thick mesh), (b) setup is run on serial local computer, (c) U.air on walls is changed from “noSlip” to “type fixedValue; uniform (0, 0, 0);”.

As I’m testing “moving–wall” boundary condition, on four sides, a non–zero tangential velocity is imposed. For example, on one of the X walls, it is “type fixedValue; uniform (0, 0, -10);" and on opposite X wall, it is "type fixedValue; uniform (0, 0, 10);". Similarly, on Z walls.

After running for sufficiently long time, U.air and U.particles velocity vector (s) are shown on horizontal slice in Figure (2). This value "10 m/s" in above paragraph is more than gas velocity which is 0.25 m/s. So, expectation is vectors close to the walls are to be aligned along wall. But it is clear that solver is ignoring “moving-wall” boundary condition and they are pointed upwards.


What is going wrong in the setup? I have tried increasing specularityCoefficient to 1.0 (in original setup, it is 0.01) in U.particles but did not see any effect of boundary condition. I can share my setup here, if anyone of you wants to take a look.


Eagerly waiting for your replies.