A Nonreflecting Formulation for Turbomachinery Boundaries and Blade Row Interfaces
Paper i proceeding, 2019

Applying a nonreflecting formulation of a boundary condition or blade row interface is sometimes of paramount importance for obtaining an accurate prediction of turbomachinery blade flutter or tonal noise, just to name a few examples. Although the theoretical foundations for these type of boundary conditions have existed for several decades, nonreflecting boundary conditions still remain an area of active research. Today, much focus appears to be put towards obtaining more generic, higher-order and numerically stable formulations. In this work, a quasi-three-dimensional nonreflecting formulation based on the exact, nonreflecting boundary condition for a single frequency and azimuthal wave number developed by Giles is presented. The proposed formulation is applicable without modifications to both steady and unsteady
simulations. An implementation strategy which is consistent for both a boundary condition and blade row interface is also presented. This implementation strategy does also partly address the stability problems often encountered when the type of formulation considered in the presented work is used together with a pseudo-time integration approach for converging the flow residual. Results from a set of two-dimensional validation cases are also presented to verify the formulation.

computational aero acoustics

Nonreflecting Boundary Conditions

harmonic balance method

turbomachinery

Computational Fluid Dynamics

Författare

Daniel Lindblad

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Gonzalo Montero Villar

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Niklas Andersson

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Computational Aeroacoustics (CAA)

AIAA 2019-1804

AIAA SciTech 2019 Forum
San Diego, USA,

Ultra Low emission Technology Innovations for Mid-century Aircraft Turbine Engines (ULTIMATE)

Europeiska kommissionen (Horisont 2020), 2015-09-01 -- 2018-09-01.

Styrkeområden

Transport

Ämneskategorier

Beräkningsmatematik

Strömningsmekanik och akustik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.2514/6.2019-1804

ISBN

9781624105784

Mer information

Senast uppdaterat

2019-09-26