This article demonstrates a method for generating a conformal and structured mesh in porous media using directed mesh. The directed mesh was previously limited to meshing only CAD geometries, this limitation was rectified with Simcenter STAR-CCM+ V13.06.
A similar process to what is demonstrated in this article can be followed with the extruded mesh. The directed mesher will be replaced by surface extruder + volume extruder; the rest of the process will remain the same.
Getting Started with Directed Meshing
Walkthrough to Generate Conformal Interfaces on Both Sides of a Directed Mesh Region
How to create Internal Walls with the Directed Mesher
How can I create a directed mesh without a CAD part?
Creating a structured mesh using Directed Mesh and Pattern tool
Pre-Processing > Meshing > Directed Meshing