[STK]

Hello foamer.

I'm trying to simulate internal face act like closed wall at certain time while act like open channel (cyclic) at different time.

First, I tried activeBaffleVelocity boundary condition, following Marpole's method(modifying boundary files to introduce baffle and wall shared identical faces.). However 1e-6 hard-cap in both closeness and openness cannot gives air-tight baffle, which is required in my case. Since activeBaffleVelocity boundary condition works as reducing superficial area Sf in calculation, removing hard cap might be not a good idea (which can introduce div by 0 err).

Then, I follow the method miotto did in 2020, where boundary types and conditions are changed between simulation, using utilities changeDictionary and foamDictionary.

From wall to cyclic is OK, but when I tried to comeback wall from cyclic, I faced with problem. Since cyclic BC doesn't require value entry at all.

However, when I comeback from cyclic to wall, I have no values to assign in new wall boundary condition. Thus I assign arbitrary uniform values in attached file. Of course, these values are different from values at baffles thus it introduce unwanted disturbs in domain.

Now I need 2 things to do

1. Get values at cyclic boundary at certain time in nonunifom List
2. Assign these nonuniform value through changeDictionary or foamDictionary

Does anybody have an idea how I can do these things?