[stephenneill112]

I have a 2-D combustion project in FLUENT for which I need to patch a zone of high temperature and products in order to ignite.

This is a trial and error type of problem so I am continuously running and stopping the solution. Each time I do so, I have to re-mark the cells and patch after initialization.

I've tried to draw the region (designmodeler) I want to patch so FLUENT will recognize it as a zone so all I need to do is patch the zone every time, rather than re-marking the cells.

My problem is, how do I draw it so the zone has no bearing on the solution or the mesh, it's only function is to be selectable for patching? In meshing they are treated as two parts, I tried meshing and translating to FLUENT, ended up with two zones but it wouldn't even attempt to solve so I know I'm doing it wrong.

Or is there a way of saving the region between simulations and when FLUENT is closed?

I have attached a simplified image to show.

Geometry is DesignModeler and Meshing is standard, not ICEM.

[LuckyTran]

Two zones is two zones, so it will always affect the mesh and solution. Btw funny things can happen at the interfaces between zones (because of the discretization schemes at boundaries).

I am curious if someone knows how to do a persistent region that can be used for patching. As a workaround, can you just have Fluent automatically mark the cells every iteration by using calculation activities?

[stephenneill112]

Originally Posted by LuckyTran

Two zones is two zones, so it will always affect the mesh and solution. Btw funny things can happen at the interfaces between zones (because of the discretization schemes at boundaries).

I am curious if someone knows how to do a persistent region that can be used for patching. As a workaround, can you just have Fluent automatically mark the cells every iteration by using calculation activities?

This is a potential workaround, however don't calculation activities require reassignment before subsequent simulations?

So this doesn't reduce the need to set something up every time.