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

Abstract

Comparison of two approaches for unsteady load computation on Immersed Boundaries • Extended presentation of a procedure to generate meshes of Immersed Boundaries • The approach is highly validated for two space launcher RANS/LES simulations • The load computation does not require extra operation and is performed on-the-fly

Numerical Simulations of a Landing Gear with Flow Through Fairings for Noise Mitigation

“…However this can introduce numerical errors that may compromise the accuracy of the acoustic post-processing. Instead, in this study, the stepwise surface reconstruction strategy developed by Manueco et al [27,28] has been adopted for the wall pressure unsteady data extraction. Indeed, this method appears of great interest in the present case, as it does not introduce any interpolation of the flow variables.…”

Comparison of several interpolation methods to reconstruct field data in the vicinity of a finite element immersed boundary

“…Hence, various techniques have been developed in order to reconstruct fields coming from a boundary on the computation domain (i.e. the computation of the velocity imposed by the IB in our case) or the contrary (reconstruction of the stress tensor on the envelop of an airfoil to compute aerodynamic forces, for instance [12]) such as: mollifier functions (used in the original IBM to approximate the Dirac delta functions [13,14]), extrapolation outside the computation domain (used in ghost cells techniques [15,16]), interpolation (widely used in all kind of fictitious domain methods [5,4]). In the case of infinitely thin obstacles, the eXtended (or Generalized) Finite Element Method (X-FEM), which is often used in the field of fracture mechanics [17,18], provides some advantages: it is capable to deal with discontinuous quantities (typically tangential velocities on each side of an infinitely thin obstacle with slip conditions) while preserving the standard finite element properties elsewhere.…”

A Finite Element Penalized Direct Forcing Immersed Boundary Method for infinitely thin obstacles in a dilatable flow

“…Thus, various techniques have been developed in order to reconstruct fields coming from a boundary on the computation domain (i.e. the computation of the velocity imposed by the IB in our case) or the contrary (reconstruction of stress on the envelope of an airfoil to compute aerodynamic forces for instance [44]). In this paper, we focus more specifically on interpolation techniques, widely used in all kind of fictitious domain methods [40,43,[45][46][47].…”