Investigation of obstacle effect to improve conjugate heat transfer in backward facing step channel using fast simulation of incompressible flow

Nouri Borujerdi, A ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1007/s00231-017-2086-4
  3. Publisher: Springer Verlag , 2018
  4. Abstract:
  5. The current study investigates the conjugate heat transfer characteristics for laminar flow in backward facing step channel. All of the channel walls are insulated except the lower thick wall under a constant temperature. The upper wall includes a insulated obstacle perpendicular to flow direction. The effect of obstacle height and location on the fluid flow and heat transfer are numerically explored for the Reynolds number in the range of 10 ≤ Re ≤ 300. Incompressible Navier-Stokes and thermal energy equations are solved simultaneously in fluid region by the upwind compact finite difference scheme based on flux-difference splitting in conjunction with artificial compressibility method. In the thick wall, the energy equation is obtained by Laplace equation. A multi-block approach is used to perform parallel computing to reduce the CPU time. Each block is modeled separately by sharing boundary conditions with neighbors. The developed program for modeling was written in FORTRAN language with OpenMP API. The obtained results showed that using of the multi-block parallel computing method is a simple robust scheme with high performance and high-order accurate. Moreover, the obtained results demonstrated that the increment of Reynolds number and obstacle height as well as decrement of horizontal distance between the obstacle and the step improve the heat transfer. © 2017, Springer-Verlag GmbH Germany
  6. Keywords:
  7. Flux-difference splitting ; Heat transfer ; Upwind compact scheme, multi-block approach ; Application programming interfaces (API) ; Facings ; Flow of fluids ; Incompressible flow ; Laminar flow ; Modeling languages ; Reynolds number ; Artificial compressibility method ; Backward facing step channel ; Compact finite difference schemes ; Conjugate heat transfer ; Fluid flow and heat transfers ; Incompressible Navier-Stokes ; Multi blocks ; Navier Stokes equations ; Flux difference splitting
  8. Source: Heat and Mass Transfer/Waerme- und Stoffuebertragung ; Volume 54, Issue 1 , 2018 , Pages 135-150 ; 09477411 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s00231-017-2086-4