Axel E. Larreteguy
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Struggling with the Modeling of Boundary Layers in Coarse Grids with the Pseudo-Direct Numerical Simulation Method (P-DNS) Open
Flow regions near solid surfaces are strongly dominated by viscosity effects and greatly affected by the near-wall pressure field. The velocity profiles are far from linear and the associated furbulence level and characteristics vary very …
A multiscale Pseudo-DNS approach for solving turbulent boundary-layer problems Open
Efficiently simulating turbulent fluid flow within a boundary layer is one of the major challenges in fluid mechanics. While skin friction may have a limited impact on drag at high Reynolds numbers, it plays a crucial role in determining t…
PDNS: A Novel Turbulence Model Suitable for Coarse Meshes Applied to Flows with Strong Pressure Gradients Around Airfoils Open
Turbulence models require specific considerations for regions near solid walls due to the presence of boundary layers. Achieving accurate estimations of wall shear stress require a sufficiently refined mesh capable of capturing the laminar…
Advances in the Pseudo-DNS Methodology: Database Construction for the Averaged Inertial Stresses on the Internal RVE Open
Pseudo Direct Numerical Simulation (pseudo-DNS) is a novel concurrent multiscale methodology which splits the numerical solution into two: the coarse and the fine parts. Here, the coarse scale solution is computed as usual using a relative…
DNS Simulations of Couette Flow at Low Reynolds Numbers Using OpenFOAM for Obtaining Effective Viscosities for a New Turbulent Model Open
This paper presents an initial stage of a new turbulent model based on effective viscosities. The model proposes solving a “global” problem using a relatively thick mesh with a pseudofluid with precalculated effective viscosities. These vi…
A Particle-Based Method for the Solution of Turbulent Fluid Flows Open
Although the Navier-Stokes equations are equivalently applicable to both laminar and turbulent fluid flows, the current computing power generally precludes employing fine meshes that would allow to simulate turbulent flows without introduc…