On the estimation of unsteady aerodynamic forces and wall spectral content with immersed boundary conditions

Autor: Sébastien Deck, Lucas Manueco, Pierre-Élie Weiss
Přispěvatelé: DAAA, ONERA, Université Paris Saclay [Meudon], ONERA-Université Paris-Saclay
Jazyk: angličtina
Rok vydání: 2020
Předmět:
General Computer Science
HYBRID RANS/LESS
Boundary (topology)
Computational fluid dynamics
CHARGEMENT DYNAMIQUE
01 natural sciences
LANCEUR
TORSEUR AERODYNAMIQUE
010305 fluids & plasmas
Physics::Fluid Dynamics
PRESSION INSTATIONNAIRE
symbols.namesake
PRESSION PAROI
[SPI]Engineering Sciences [physics]
LANCEUR ARIANE 5
0103 physical sciences
PRESSION INSTATI
LANCEUR SPATIAL
Boundary value problem
AERODYNAMIC FORCES
0101 mathematics
FRONTIÈRES IMMERGÉES
IMMERSED BOUNDARY
Physical quantity
[PHYS]Physics [physics]
business.industry
FLUCTUATING PRESSURE FIELD
General Engineering
Reynolds number
Mechanics
EFFORTS
ZONAL DETACHED EDDY SIMULATION
HIGH REYNOLDS NUMBER
010101 applied mathematics
Aerodynamic force
LANCEUR AXISYMETRIQUE
symbols
Compressibility
Detached eddy simulation
FORCES
business
Geology
SPA
Zdroj: Computers and Fluids
Computers and Fluids, Elsevier, 2020, 201 (104471), pp.1-15. ⟨10.1016/j.compfluid.2020.104471⟩
ISSN: 0045-7930
DOI: 10.1016/j.compfluid.2020.104471⟩
Popis: International audience; Immersed boundary conditions (IBC) have become a practical tool to simplify the meshing process for the simulation of complex geometries in CFD. This approach has reached a sufficient level of maturity to allow the simulation of compressible high Reynolds number flows. However, the access of physical quantities at the immersed wall is far from being straightforward. This paper provides two methods for the reconstruction of fluctuating wall quantities relying on the creation of explicit watertight surface meshes of the immersed boundary. These surface meshes are used for the investigation of highly unsteady compressible flows of two generic space launcher afterbody configurations using Zonal Detached Eddy Simulation (ZDES). Since the flows are massively separated, the side load arising from the pressure is mainly responsible for the global load unsteadiness. Therefore, in the present study the focus is put on the accuracy of the wall pressure reconstructed on immersed boundaries and compared to validated numerical simulations using a classical body-fitted approach and experimental data. The numerical results demonstrate the ability of the present approaches to accurately capture the global load fluctuation around both afterbody configurations. Moreover, the IBC surface meshes simplify the overall post-processing operations and allow the extraction of wall quantities for unsteady simulation at low computational cost. This last feature has been used for the spectral analysis on IBC surfaces which reproduced successfully the location and the intensity of the pressure fluctuation.
Databáze: OpenAIRE
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