[mostanad]

Hi Foamers,
I hope everything is going well for you in this pandemic time. My question is about using CyclicAMI boundary condition along with dynamic mesh refinement tool. As we know, dynamic mesh refinement works based on a specified field and some refinement levels. This level can be saved in polymesh directory of every timestep by cellLevel files.

In this regard, the attached image shows that my moving object, which the refinement is done based on that, is close to my periodic surface. However, we don't have the refinement on the other side. So can you please tell me whether there is any specific configuration in DynamicMeshDict for cyclicAMI BC?
Thank you for your time in advance.
Mohammad

[Tamas]

I guess, it is not possible to use dynamic mesh refinement on cyclicAMI interfaces. The cell to cell addressing is done at the beginning of the simulation, hence changing the mesh on AMI interfaces during the run is not acceptable. Therefore, the simulation will crash, in my opinion.

Originally Posted by mostanad

Hi Foamers,
I hope everything is going well for you in this pandemic time. My question is about using CyclicAMI boundary condition along with dynamic mesh refinement tool. As we know, dynamic mesh refinement works based on a specified field and some refinement levels. This level can be saved in polymesh directory of every timestep by cellLevel files.

In this regard, the attached image shows that my moving object, which the refinement is done based on that, is close to my periodic surface. However, we don't have the refinement on the other side. So can you please tell me whether there is any specific configuration in DynamicMeshDict for cyclicAMI BC?
Thank you for your time in advance.
Mohammad

[mostanad]

I think you are wrong Tamas.
I am using dynamic mesh refinement with cyclicAMI without any problem. The issue is just with using the periodic cellLevel values at periodic sides. I believe cyclicAMI, in comparison to cyclic BC, is compatible with dynamic mesh refinement since it tries to match the different refined cells in the periodic sides.
Mohammad

[Tamas]

Hi!


You are right, sorry for my misunderstand. As far as I remember, the refinement is not detected at the other side of the cyclic boundary condition when using cyclicAMI. Only solution for that is using normal cyclic BC then the cell faces will find their corresponding cell faces at meshing (snappyHexMesh) phase, and a 1 to 1 connection will be set. Hence the refinement is detected on both sides.

[mostanad]

I think something else is happening. Dynamic refinement takes place based on the specified field. If we use the cyclicAMI (or even cyclic), the field value would be transferred to the other side and the refinement happens at this side as well. However, my problem is something else. I have the moving object very close to periodic side. So this field is really close to the other side so that it is not yet transferred to that side. So it does not detect cycling until it passes the periodic boundary. The solution for this problem, as I've showed in my previous post, is setting the periodic boundary condition for the cellLevel parameter as well. The refinement method detects the need for refining based on this parameter.

Regarding using cyclic or cylicAMI I still believe that we just can use cyclicAMI boundary condition for the case with dynamic refinement since it needs to match the meshes with different shapes at these periodic boundaries.
Cheers
Mohammad

[yirenxindudu]

Hi there,

I'm facing the same problem, i.e., appling cyclic boundary conditions with dynamic mesh refinement.

Best
Che