Accurate scheme : Turb Flow

Turb’Flow™ is the result of more than 20 years of research and constant development, started at the Laboratory of Fluid Mechanics and Acoustic of Ecole Centrale de Lyon (CNRS). Initially dedicated to complex problems of turbomachineries, it integrates precise models for physics such as turbulence, shocks, unsteadiness and instabilities, high order numerical schemes spatial as well as temporal.

The main purpose was to link fundamental research to real problems met in the industry, and, in particular, to integrate the new tools from the scientific literature in turbomachinery.

Expertise in turbomachinery

Flows that are generally encountered in rotating turbomachines are transonic, unsteady and turbulent. The geometries typically have a high degree of curvature, leading to a strongly tridimensional swirling turbulent flow. Propagating shockwaves, contact discontinuities and the interactions between both complex phenomena must be accurately modelled.

Indeed, in transonic regime, shockwaves are of main importance in the global performance of the turbomachine. Turb’Flow™ has been highly used for simulating these confined multi-dimensional flows with discontinuities. Among its capabilities, we can mention in this section some features like:

Turb’Flow™ permet d'étudier, par exemple :

Evaluation of characteristics, losses and deviation model for compressor blades
Rotor-stator interactions, effects of gap size, analysis of mechanisms inducing tipleakage flows
Fan and compressor conception and optimal design
Blade-to-blade flow analyses ….

Prediction of vibrations

Design and conception of turbine blades require the prediction of the source of fatigue of the structure. Turb’Flow, both for fundamental research and for industrial problems is today used for studying of fluidstructure coupling with imposed mode structure, for the comprehension and analysis of flutter issues as fluctuating detachments, acoustic blockage, interaction with turbulence, coincidence of modes, etc.

Features

Unsteady, compressible Navier Stokes equations
Parallel with PVM or MPI, Multi-block structured meshes
MUSCL finite volume formulation, node centered
RANS turbulence modelling: 2 k-w equations of Wilcox and KOK
LES: self adapting Smagorinsky model, filtered structure function model, …
Implicit and explicit temporal time marching
Spatial centered schemes up to 4th, upwind schemes up to 3rd order, with optional limiters.
Low-mach number preconditionning