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Thermodynamics of a real fluid near the critical point in numerical simulations of isotropic turbulence
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-2830-0454
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Fysiokemisk strömningsmekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-3336-1462
2016 (Engelska)Ingår i: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, nr 12, artikel-id 125105Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2016. Vol. 28, nr 12, artikel-id 125105
Nyckelord [en]
Equations of state, Kinetic energy, Kinetics, Numerical models, Probability density function, Reynolds number, Thermodynamic properties, Thermodynamics, Turbulence, Energy equation, Equation of state, Hybrid lattice, Isotropic turbulence, Real fluids, Spectral behaviors, Temperature increase, Thermodynamic variables
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Identifikatorer
URN: urn:nbn:se:kth:diva-201175DOI: 10.1063/1.4972276ISI: 000392092300028Scopus ID: 2-s2.0-85008226100OAI: oai:DiVA.org:kth-201175DiVA, id: diva2:1072959
Forskningsfinansiär
Vetenskapsrådet, VR2010-3938; VR2011-5355
Anmärkning

QC 20170209

Tillgänglig från: 2017-02-09 Skapad: 2017-02-09 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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Albernaz, Daniel L.Do-Quang, MinhAmberg, Gustav
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MekanikLinné Flow Center, FLOWFysiokemisk strömningsmekanik
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Physics of fluids
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