Convergence problem with 1. mixed porous media and air system 2. rough/spiky geometry #30620
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You can use a FunctionEnableControl to do that |
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yes, only the first few steps
this is interesting, and how would I do this, my drag/porosity map is changing, lets say, every 20000 sec (due to miningframe update) do i spend the first 10 sec of every miningframe ramping viscosity down from 1 to 2e-5, something like this? |
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Question
Hi
so i'm working on flow in mine/cave material problem
@GiudGiud mentioned in another thread of mine
currently I let all the element to be void (porosity = 1) but only assign drag term to the elements at different domain (this doesn't help much)
I tried below, but still doesn't help much
below is the way I control outlet vel (not sure if this is even the right way)
quick note: while i'm typing I have an idea, since the cave material move down with time it will open up the flow channel, maybe I can set extremely low flow (or no flow) during the time that tunnels are blocked and ramp up the flow (both TOP inlet and outlet) when they are unblocked
but how do i do that? to only let the BC at the top active at t > a certain time
I could set function like this but i dont no enforce flow means vel = 0
this is only outlet, how do i control inlet in such a way as well?
note2: it some cases it converges fine ie when I let perm in cave to be higher (less friction), no flow at all at the top part, only flow in and out at the bottom, etc
for example:
during the first jacobian step it will just give this error
and it will just keep repeating until the simulation stop
but when i pad it with smoother layer of element, it solves fine, i dont understand why is that the case?
so it's impossible for me to move to the cave scale where the cave elements are quick spiky
below are the solver setting that i'm using:
Thank you!
Traiwit
Additional information
Mesh size and type: 100k-500k element
Reynolds number:
Discretization (finite element CG/DG, finite volume, etc): finite volume
Models (turbulence, porous media, etc): porous media
Solver method (fully coupled, segregated, multiapps, etc): fully coupled
Base input you started from:
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