Flutter Computation of Turbomachinery Cascades Using a Parallel Unsteady Navier-Stokes Code

نویسندگان

  • Shanhong Ji
  • Feng Liu
چکیده

Aquasi-three-dimensional multigrid Navier–Stokes solver on singleandmultiple-passage domains is presented for solving unsteady  ows around oscillating turbine and compressor blades. The conventional direct store method is used for applying the phase-shifted periodic boundary condition over a single blade passage. A parallel version of the solver using the message passing interface standard is developed for multiple-passage computations. In parallel multiple-passage computations, the phase-shifted periodic boundary condition is converted to a simple inphase periodic condition. Euler and Navier–Stokes solutions are obtained for unsteady  ows through an oscillating turbine cascade blade row with both the sequential and the parallel codes. It is found that the parallel code offers almost linear speedup with a slope close to 1 on multiple CPUs. In addition, signiŽ cant improvement is achieved in convergence of the computation to a periodic unsteady state in the parallel multiple-passage computations due to the use of the in-phase periodic boundary conditions compared with that in the single-passage computations with phase-shifted periodic boundary conditions via the direct store method. The parallel Navier–Stokes code is also used to calculate the  ow through an oscillating compressor cascade. Results are compared with experimental data and computations by other authors.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Computation of Cascade Flutter with a Coupled Aerodynamic and Structural Model

A computational method for flutter simulation of turbomachinery cascades is presented. The flow through multiple blade passages is calculated using a time-domain approach with coupled aerodynamic and structural models. The unsteady Euler/Navier-Stokes equations are solved in 2D using a second-order implicit scheme with dual time-stepping and a multigrid method. A structural model for the blades...

متن کامل

Test Problem and Parallelization Strategy

ENSAERO [1], is a multidisciplinary code for computing the unsteady flow and associated aeroelastic responses of aerospace vehicles. The code simultaneously integrates the time-dependent Euler or thin-layer, Reynolds-averaged Navier-Stokes equations and the structural equations of motion using aeroelastically adaptive dynamic grids. The code can predict static and dynamic response for flexible ...

متن کامل

Computation of Unsteady Nonlinear Flows in Cascades Using a Harmonic Balance Technique

A harmonic balance technique for modeling unsteady nonlinear  ows in turbomachinery is presented. The analysis exploits the fact that many unsteady  ows of interest in turbomachinery are periodic in time. Thus, the unsteady  ow conservation variables may be represented by a Fourier series in time with spatially varying coefŽ cients. This assumption leads to a harmonic balance form of the Eul...

متن کامل

Development and Validation of a Massively Parallel Flow Solver for Turbomachinery Flows

The development and validation of the unsteady, three-dimensional, multiblock, parallel turbomachinery  ow solver TFLO is presented. The unsteady Reynolds-averaged Navier–Stokes equations are solved using a cellcentered discretizationon arbitrarymultiblockmeshes. The solutionprocedure is basedon efŽ cient explicit Runge– Kuttamethodswith several convergenceacceleration techniques such asmultig...

متن کامل

A Message-Passing Distributed Memory Parallel Algorithm for a Dual-Code Thin Layer, Parabolized Navier-Stokes Solver

In this study, the results of parallelization of a 3-D dual code (Thin Layer, Parabolized Navier-Stokes solver) for solving supersonic turbulent flow around body and wing-body combinations are presented. As a serial code, TLNS solver is very time consuming and takes a large part of memory due to the iterative and lengthy computations. Also for complicated geometries, an exceeding number of grid...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2002