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Computing Optimal Forcing Using Laplace Preconditioning

Part of: Numerical linear algebra Hydrodynamic stability Basic methods in fluid mechanics

Published online by Cambridge University Press:  31 October 2017

M. Brynjell-Rahkola ,
L. S. Tuckerman ,
P. Schlatter  and
D. S. Henningson
M. Brynjell-Rahkola*
Affiliation:
Linné FLOW Centre and Swedish e-Science Research Centre (SeRC), KTH Mechanics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
L. S. Tuckerman*
Affiliation:
PMMH (UMR 7636 CNRS – ESPCI – UPMC Paris 6 – UPD Paris 7), 10 rue Vauquelin, 75005 Paris, France
P. Schlatter*
Affiliation:
Linné FLOW Centre and Swedish e-Science Research Centre (SeRC), KTH Mechanics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
D. S. Henningson*
Affiliation:
Linné FLOW Centre and Swedish e-Science Research Centre (SeRC), KTH Mechanics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
*
*Corresponding author. Email addresses:mattiasbr@mech.kth.se(M. Brynjell-Rahkola), laurette.tuckerman@espci.fr(L. S. Tuckerman), pschlatt@mech.kth.se(P. Schlatter), henning@mech.kth.se(D. S. Henningson)
*Corresponding author. Email addresses:mattiasbr@mech.kth.se(M. Brynjell-Rahkola), laurette.tuckerman@espci.fr(L. S. Tuckerman), pschlatt@mech.kth.se(P. Schlatter), henning@mech.kth.se(D. S. Henningson)
*Corresponding author. Email addresses:mattiasbr@mech.kth.se(M. Brynjell-Rahkola), laurette.tuckerman@espci.fr(L. S. Tuckerman), pschlatt@mech.kth.se(P. Schlatter), henning@mech.kth.se(D. S. Henningson)
*Corresponding author. Email addresses:mattiasbr@mech.kth.se(M. Brynjell-Rahkola), laurette.tuckerman@espci.fr(L. S. Tuckerman), pschlatt@mech.kth.se(P. Schlatter), henning@mech.kth.se(D. S. Henningson)
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Abstract

For problems governed by a non-normal operator, the leading eigenvalue of the operator is of limited interest and a more relevant measure of the stability is obtained by considering the harmonic forcing causing the largest system response. Various methods for determining this so-called optimal forcing exist, but they all suffer from great computational expense and are hence not practical for large-scale problems. In the present paper a new method is presented, which is applicable to problems of arbitrary size. The method does not rely on timestepping, but on the solution of linear systems, in which the inverse Laplacian acts as a preconditioner. By formulating the search for the optimal forcing as an eigenvalue problem based on the resolvent operator, repeated system solves amount to power iterations, in which the dominant eigenvalue is seen to correspond to the energy amplification in a system for a given frequency, and the eigenfunction to the corresponding forcing function. Implementation of the method requires only minor modifications of an existing timestepping code, and is applicable to any partial differential equation containing the Laplacian, such as the Navier-Stokes equations. We discuss the method, first, in the context of the linear Ginzburg-Landau equation and then, the two-dimensional lid-driven cavity flow governed by the Navier-Stokes equations. Most importantly, we demonstrate that for the lid-driven cavity, the optimal forcing can be computed using a factor of up to 500 times fewer operator evaluations than the standard method based on exponential timestepping.

Keywords

Hydrodynamic stabilityoptimal forcingLaplace preconditioneriterative methodseigenvalue problemGinzburg-Landau equationlid-driven cavity flow

MSC classification

Secondary: 76M25: Other numerical methods 65F08: Preconditioners for iterative methods 76E15: Absolute and convective instability and stability 76E09: Stability and instability of nonparallel flows 65F15: Eigenvalues, eigenvectors
Type
Research Article
Information
Communications in Computational Physics , Volume 22 , Issue 5 , November 2017 , pp. 1508 - 1532
Copyright
Copyright © Global-Science Press 2017 

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