High Fidelity Simulations and Modelling of Dissipation in Boundary Layers of Non-ideal Fluid Flows

Francesco Tosto*, Andrew Wheeler, Matteo Pini

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientificpeer-review

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Abstract

In this work, we investigate the sources of dissipation in adiabatic boundary layers of non-ideal compressible fluid flows. Direct numerical simulations of transitional, zero-pressure gradient boundary layers are performed with an in-house solver considering two fluids characterized by different complexity of the fluid molecules, namely air and siloxane MM. Different sets of thermodynamic free stream boundary conditions are selected to evaluate the influence of the fluid state on the frictional loss and dissipation mechanisms. The thermo-physical properties of siloxane MM are obtained with a state-of-the-art equation of state. Results show that the dissipation due to both time-mean strain field and irreversible heat transfer, and the turbulent dissipation are significantly affected by both the molecular complexity of the fluid and its thermodynamic state. The dissipation coefficient calculated from the DNS is then compared against the one obtained from a reduced-order boundary layer CFD model [1] which has been extended to treat fluids modeled with arbitrary equations of state [7].

Original languageEnglish
Title of host publicationERCOFTAC Series
EditorsM. White
PublisherSpringer
Pages62-71
Number of pages10
ISBN (Electronic)978-3-031-30936-6
DOIs
Publication statusPublished - 2023

Publication series

NameERCOFTAC Series
Volume29
ISSN (Print)1382-4309
ISSN (Electronic)2215-1826

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • boundary layer
  • Direct Numerical Simulation
  • dissipation coefficient
  • Non-Ideal Compressible Fluid Dynamics
  • organic Rankine cycle
  • turbulence

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