High-Fidelity Versatile Incompressible Flow Solver for Direct Numerical Simulations and Linear Stability Investigations

Shirzad Hosseinverdi, Hermann F. Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

A high-fidelity versatile incompressible Navier-Stokes code was developed that is applicable for both Direct Numerical Simulations (DNS) and linear global stability investigations. The solver is based on a vorticity-velocity formulation of the Navier-Stokes equations for curvilinear orthogonal grids. It is programmed in Fortran 90 and employs parallelization using a hybrid MPI-OpenMP. The code incorporates advanced numerical algorithms, specially designed for simulations of transitional and turbulent flows. The solver includes linear stability modules based on the linearized Navier-Stokes equations (LNSE) that are tailored for primary and secondary instability investigations. No further assumptions are necessary (other than small amplitudes) with respect to the baseflow, and the primary wave as are required for conventional Linear Stability Theory (LST) and/or for Parabolic Stability Equations (PSE) analyses. Furthermore, since here the linear stability analysis is based on an initial value problem for LNSE, it is applicable for both convective and absolute/global instability with respect to both primary and secondary instability. An additional major advantage of the developed versatile solver is that linear/non-linear effects can be consistently evaluated by turning off/on the nonlinear terms. The new solver was employed for DNS of the flow for a wing section at a chord Reynolds number of Re = 200k. The capability of the linear stability modules was demonstrated by investigating the primary and secondary (convective & absolute) instability mechanisms for boundary layers and the flow past a circular cylinder.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum 2022
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106316
DOIs
StatePublished - 2022
Externally publishedYes
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022 - San Diego, United States
Duration: Jan 3 2022Jan 7 2022

Publication series

NameAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
Country/TerritoryUnited States
CitySan Diego
Period1/3/221/7/22

ASJC Scopus subject areas

  • Aerospace Engineering

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