Effects of High‐Density Gradients on Wildland Fire Behavior in Coupled Atmosphere‐Fire Simulations

Coupled atmosphere-fire modeling is recognized as a relevant approach for the representation of interaction between wildland fire and local meteorology at landscape scales. The atmospheric model component used in coupled system based on several approximations, which are adopted computational efficiency or physical processes representation, including widely anelastic approximation. validity domain approximation may be questioned context high-resolution due to large fire-induced heat releases near surface. This study aims this question with MesoNH Blaze model. A compressible version MesoNH-Blaze has been developed comparison system. FireFlux I experimental comparative conducted 10-m 25-m horizontal resolution. Results show significant anelastic/compressible differences resolution occurring higher velocities presence gravity waves downstream fire. addition plume realistic larger vertical velocities. Differences much smaller all evaluated processes. only enriches physics underlying fire-atmosphere interactions very high resolution, means that remains large-scale simulations, considering economy concerning numerical costs.