Parameter estimation for complex models using Bayesian inference is usually a very costly process as it requires a large number of solves of the forward problem. We propose here an approach to reduce the computational cost by constructing surrogate models that provide approximations of the true solutions of the forward problem. The surrogate models are built in an adaptive manner using a poster...

High-order methods have demonstrated their potential in large eddy simulations (LES) of turbulent flows with relatively low Reynolds numbers. The cost becomes a serious limiting factor for high Reynolds number problems. A promising approach to reduce the cost of these simulations is the hybrid Reynolds-Averaged Navier-Stokes (RANS)/LES approach. In this paper, a new hybrid RANS-Implicit LES (IL...

An unstructured grid method is presented to compute three-dimensional compressible turbulent flows for complex geometries. The Navier-Stokes equations along with the one equation turbulence model of Spalart-Allmaras are solved using a parallel, matrix-free implicit method on unstructured tetrahedral grids. The developed method has been used to predict drags in the transonic regime for both DLRF...

The nsmb code (Navier-Stokes Multi-Block) solves the fully coupled system of equations simultaneously using a cell-centered finitevolume approach. This note assesses the sensitivity to some turbulence models and numerical schemes implemented in nsmb when computing two test cases in standard mode, that is, without tuning the code to these two cases. The cases are 1. subsonic flow around the ms(1...

In this work the use of Residual Distribution schemes for the discretization of conservation laws is described. The scheme uses a Lagrangian interpolation of the solution over the element to achieve high order spatial accuracy for steady problems. The formulation is compact and easily generalizable to all spatial dimensions and to all type of elements. The accuracy of the numerical scheme is pr...

A fast Newton-Krylov algorithm is presented for solving the compressible Navier-Stokes equations on structured multi-block grids with application to turbulent aerodynamic flows. The oneequation Spalart-Allmaras model is used to provide the turbulent viscosity. The optimization of the algorithm is discussed. ILU(4) is suggested for a preconditioner, operating on a modified Jacobian matrix. An ef...

The efficiency of a turbine increases in general with an increase of the temperature of the working gas. In modern turbines this gas temperature may well exceed the melting temperature of the metal walls (Harasgama, 1995). Locally high heat transfer can lead to an excessive temperature and high thermal stresses in the walls, causing an early fatigue of the high pressure turbine components. Thus...