THREE-DIMENSIONAL ANALYSIS OF TURBINE ROTOR FLOW INCLUDING TIP CLEARANCE

A 3D Navier-Stokes investigation of a high pressure turbine rotor blade including tip clearance effects is presented. The 3D Navier-Stokes code developed at ONERA solves the three-dimensional unsteady set of mass-averaged Navier-Stokes equations by the finite volume technique. A one step Lax-Wendroff type scheme is used in a rotating frame of reference. An implicit residual smoothing technique has been implemented, which accelerates the convergence towards the steady state. A mixing length model adapted to 3D configurations is used. The turbine rotor flow is calculated at transonic operating conditions. The tip clearance effect is taken into account. The gap region is discretized using more than 55,000 points within a multi-domain approach. The solution accounts for the relative motion of the blade and casing surfaces. The total mesh is composed of five sub-domains and counts 710,000 discretization points

Recent developments performed at ONERA for the simulation of 3D inviscid and viscous flows in turbomachinery by the solution of Euler and Navier-Stokes equations

Communication to : 11th ISABE, Tokyo, JP, September 20-24, 1993SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1993 n.155 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Application des calculs Navier-Stokes a l'aerodynamique des turbines et des compresseurs

30"eme colloque d'aerodynamique appliquee : utilisation des calculs 'Navier-Stokes' pour les applications, Nantes (France), 25-27 octobre 1993SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1994 n.17 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Numerical methods and results for turbulent flows around transport aircrafts

Communication to : 1st ONERA-DLR Aerospace symposium, Paris (France), June 21-24, 1999SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1999 n.147 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

elsA-Hybrid: an all-in-one structured/unstructured solver for the simulation of internal and external flows. Application to turbomachinery

This paper reports recent work on the extension of the multiblock structured solver elsA to deal with hybrid grids. The new hybrid-grid solver is called elsA-H (elsA-Hybrid), is based on the investigation of a new unstructured-grid module has been built within the original elsA CFD (computational fluid dynamics) system. The implementation benefits from the flexibility of the object-oriented design. The aim of elsA-H is to take advantage of the full potential of structured solvers and unstructured mesh generation by allowing any type of grid to be used within the same simulation process. The main challenge lies in the numerical treatment of the hybrid-grid interfaces where blocks of different type meet. In particular, one must pay attention to the transfer of information across these boundaries, so that the accuracy of the numerical scheme is preserved and flux conservation is guaranteed. In this paper, the numerical approach allowing to achieve this is presented. A comparison between the hybrid and the structured-grid methods is also carried out by considering a fully hexahedral multiblock mesh for which a few blocks have been transformed into unstructured. The performance of elsA-H for the simulation of internal flows will be demonstrated on a number of turbomachinery configurations

3-D Navier-Stokes computations in transonic compressor bladings

Extrait de : Xth ISABE (International symposium on air breathing engines), Nottingham (UK), September 1-6, 1991SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1991 n.154 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

3-D turbomachinery Euler and Navier-Stokes calculations with a multidomain cell-centered approach

Communication to : AIAA/SAE/ASME/ASEE 29th Joint Propulsion Conference and Exhibit, Monterey, CA (USA), June 28-30, 1993Available at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1993 n.106 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc