[boffin5]

Hi,
My case is the simulation of a car radiator, and with help I have completed the mesh setup. This consists of 2 regions, one for the fluid (air) and the other for the solid (the radiator) which will be the porous zone. Also for realism there is a fairing, as shown in the attached image.
I want to run this first simply as 1.) an airflow through the radiator case, and then 2.) as a heat transfer case with a heated radiator. My question today concerns setting up 1.), the simple airflow case.


Following blockMesh, I run splitMeshRegions -cellZones; this creates the two regions. Now, I need to use fvOptions to assign DarcyForchheimer coefficients to set the porous properties of the radiator. Here is where my knowledge gets a bit shaky: fvOptions needs to know a cellZone for the properties. The splitmesh function creates regions. So I used topoSet surfaceToCell to create a cellZone from the radiator stl file. However, I discovered that the surfaceToCell function does not actually split the cells at the radiator surface interface (see image of what it captures).


So how to tell fvOptions which cellZone to use? The splitmesh function created a seemingly appropriate region (see the 3rd image showing the radiator), but do I need to convert this into a cellZone to feed into fvOptions? Is so, how do I do this? Do need to create fluid to solid interface faces? Attached is a zip file of my system folder, and it also includes the radiator stl file.

When I get this resolved, I want to include the heat transfer element into the simulation, but that is part 2.) which is waiting in the wings.


Thanks again for all your help!