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Implementation of an Adjoint-Based Optimization With Scalar Transport

[+] Author Affiliations
Eysteinn Helgason, Siniša Krajnović

Chalmers University of Technology, Gothenburg, Sweden

Paper No. IMECE2014-39691, pp. V007T09A089; 7 pages
doi:10.1115/IMECE2014-39691
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering Systems and Technologies
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4954-5
  • Copyright © 2014 by ASME

abstract

A sensitivity analysis of a particle distribution at the outlet of a 2D-channel is presented. A convection-diffusion equation is used to represent the distribution of particles in a flow. The flow is governed by the Reynolds-Averaged Navier-Stokes equations. The particles follow the medium to the outlet, where the goal is to obtain uniform distribution of the particles. A goal function for the particle distribution at the outlet is presented, and the gradient of the goal function with respect to the normal motion of the surface is calculated. The calculation of the gradient is performed by applying the so-called adjoint method. For this, the adjoint scalar transport equation and the relevant adjoint RANS equations are implemented. The calculation cost of the entire sensitivity field is roughly twice the cost of a standard convection-diffusion particle simulation. This results in computationally cheap gradients compared to traditional methods. The results are verified by comparing the gradients calculated using the adjoint method to gradients obtained using numerical differentiation.

Copyright © 2014 by ASME
Topics: Scalars , Optimization

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