The Limits of Porous Materials in the Topology Optimization of Stokes Flows

Journal Article · Sat Oct 15 04:00:00 EDT 2005 · Applied Mathematics and Optimization

DOI:https://doi.org/10.1007/S00245-005-0828-Z· OSTI ID:21067433

Evgrafov, Anton ^[1]

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1. Center for Aerospace Structures, Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429 (United States)

We consider a problem concerning the distribution of a solid material in a given bounded control volume with the goal to minimize the potential power of the Stokes flow with given velocities at the boundary through the material-free part of the domain.We also study the relaxed problem of the optimal distribution of the porous material with a spatially varying Darcy permeability tensor, where the governing equations are known as the Darcy-Stokes, or Brinkman, equations. We show that the introduction of the requirement of zero power dissipation due to the flow through the porous material into the relaxed problem results in it becoming a well-posed mathematical problem, which admits optimal solutions that have extreme permeability properties (i.e., assume only zero or infinite permeability); thus, they are also optimal in the original (non-relaxed) problem. Two numerical techniques are presented for the solution of the constrained problem. One is based on a sequence of optimal Brinkman flows with increasing viscosities, from the mathematical point of view nothing but the exterior penalty approach applied to the problem. Another technique is more special, and is based on the 'sizing' approximation of the problem using a mix of two different porous materials with high and low permeabilities, respectively. This paper thus complements the study of Borrvall and Petersson (Internat. J. Numer. Methods Fluids, vol. 41, no. 1, pp. 77-107, 2003), where only sizing optimization problems are treated.

• OSTI ID: 21067433
• Journal Information: Applied Mathematics and Optimization, Journal Name: Applied Mathematics and Optimization Journal Issue: 3 Vol. 52; ISSN 0095-4616
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
APPROXIMATIONS
CONTROL THEORY
DISTRIBUTION
EQUATIONS
MATHEMATICAL SOLUTIONS
OPTIMIZATION
PERMEABILITY
POROUS MATERIALS
TENSORS
TOPOLOGY