2 research outputs found
Evaluation of nacelle drag using Computational Fluid Dynamics
Thrust and drag components must be defined and properly accounted in order to estimate aircraft performance, and this hard task is particularty essential for propulsion system where drag components are functions of engine operating conditions. The present work describes a numerical method used to calculate the drag in different nacelles, long and short ducted. Two- and three-dimensional calculations were performed, solving the Reynolds Averaged Navier-Stokes (RANS) equations with a commercial Computational Fluid Dynamics (CFD) code. It is then possible to obtain four drag components: wave, induced, viscous and spurious drag using a far-field formulation. An expression in terms of entropy variations was shown and drag for different nacelle geometries was estimated
Complete quantum-inspired framework for computational fluid dynamics
Computational fluid dynamics is both an active research field and a key tool
for industrial applications. The central challenge is to simulate turbulent
flows in complex geometries, a compute-power intensive task due to the large
vector dimensions required by discretized meshes. Here, we propose a full-stack
solver for incompressible fluids with memory and runtime scaling
polylogarithmically in the mesh size. Our framework is based on matrix-product
states, a powerful compressed representation of quantum states. It is complete
in that it solves for flows around immersed objects of diverse geometries, with
non-trivial boundary conditions, and can retrieve the solution directly from
the compressed encoding, i.e. without ever passing through the expensive
dense-vector representation. These developments provide a toolbox with
potential for radically more efficient simulations of real-life fluid problems