[kahjoonyong]

Hello,

I am trying to simulate a simple 2D turbulence flow through a channel with hill in order to get my hand on this software. The idea is to be able to hone my skill using this software before proceeding to a simulation for a reactive flow.

The profile is taken directly from this simulation from NASA, https://turbmodels.larc.nasa.gov/Oth..._periodic.html

Here is a link (http://imgur.com/a/hMS7S) to my case setup and geometry.

I have first simulated this case using only fixed embedding at the top and bottom wall boundary. The simulation was done using both k-Epsilon and k-Omega turbulence model. The results could be seen in the link as well. However the base grid I used for this settings is very fine throughout the profile and it took a long time to simulate. Therefore I would like to try out the AMR setting.

However, AMR would not activate throughout the whole simulation. The number of cells do not increase and no mesh refinement was seen in the post processed results. I have tried to coarsen/refine the base grid, manipulate the grid ratio, deactivate Fixed Embedding, manipulate the embedding scale either or both in Fixed Embedding or/and AMR settings, etc. Nothing seems to work. The only time AMR was shown working is when I increase the 'minimum cells' setting to a very high number. Nevertheless, the simulation crashed when the cell count increased.

I have been trying out different combinations of settings over the course of two weeks. I have been looking everywhere in the internet and in manuals, nothing gives useful resources. I hope someone could take a look in it.

I have attached the .cvg file of the case here as well. Hill.zip
The boundary settings for the wall might vary a little from what I have written in the following lines because I have tested other settings as well. For k-Omega No-Slip boundary conditions are applied.

Short overview of the boundaries:

1. Top and Bottom:
Wall
Velocity: Law of wall
Temperature: Specified value

2. Left Inlet:
Inflow
Velocity in x-Direction 5m/s
Pressure: Zero normal gradient

3. Right outlet
Outflow
Velocity: Zero normal gradient
Pressure: 101325Pa

4. Front and Back
2D

Thank you.