Topography Adapted Mesh Generation for Atmospheric Boundary Layer Flow Simulation

We present a new hybrid meshing procedure specifically designed to simulate Atmospheric Boundary Layer (ABL) flows featuring Coriolis effects for onshore applications. Two new meshing contributions for ABL flow simulation are proposed. First, a new metric-based adaptive meshing process to discretize the topography is presented. The adaptivity process is specifically written to deal with the discrete nature of topographic data, reparemeterizing smoothly the topography to allow computing the first and second order derivatives required by the desired metrics. Second, we present a new hybrid mesh generation procedure to discretize the ABL. We generate a prismatic boundary layer that captures the gradients of the Surface Boundary Layer, and following, an unstructured mesh is generated to discretize the rest of the domain. We show examples to illustrate the reduction in the element count with respect to standard semi-structured approaches, and we present the simulation result obtained on an onshore topographical scenario.