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Thermodynamics of a real fluid near the critical point in numerical simulations of isotropic turbulence
KTH.
KTH.
University of Washington, Seattle, USA.
2016 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 12, 125105Article in journal (Refereed) Published
Abstract [en]

We investigate the behavior of a fluid near the critical point by using numerical simulations of weakly compressible three-dimensional isotropic turbulence. Much has been done for a turbulent flow with an ideal gas. The primary focus of this work is to analyze fluctuations of thermodynamic variables (pressure, density, and temperature) when a non-ideal Equation Of State (EOS) is considered. In order to do so, a hybrid lattice Boltzmann scheme is applied to solve the momentum and energy equations. Previously unreported phenomena are revealed as the temperature approaches the critical point. Fluctuations in pressure, density, and temperature increase, followed by changes in their respective probability density functions. Due to the non-linearity of the EOS, it is seen that variances of density and temperature and their respective covariance are equally important close to the critical point. Unlike the ideal EOS case, significant differences in the thermodynamic properties are also observed when the Reynolds number is increased. We also address issues related to the spectral behavior and scaling of density, pressure, temperature, and kinetic energy.

Place, publisher, year, edition, pages
2016. Vol. 28, no 12, 125105
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:sh:diva-32188DOI: 10.1063/1.4972276ISI: 000392092300028OAI: oai:DiVA.org:sh-32188DiVA: diva2:1078037
Funder
Swedish Research Council, 2010-3938Swedish Research Council, 2011-5355EU, FP7, Seventh Framework Programme, 312763
Available from: 2017-03-02 Created: 2017-03-02 Last updated: 2017-11-29Bibliographically approved

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Amberg, Gustav

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