Real fluids near the critical point in isotropic turbulence
(English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666Article in journal, Editorial material (Refereed) In press
We investigate the behavior of a uid near the critical point by using numerical simulations of weakly compressible three-dimensional isotropic turbulence. Much has been done for a turbulent ow with an ideal gas. The primary focus of this work is to analyze uctuations 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. These phenomena include increased uctuations in pressure, density and temperature, followed by changes in their respective probability density functions (PDFs). Unlike the ideal EOS case, signicant dierences 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.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-183483OAI: oai:DiVA.org:kth-183483DiVA: diva2:911699
FunderSwedish Research Council, 2010-3938Swedish Research Council, 2011-5355
QP 20162016-03-142016-03-142016-03-14Bibliographically approved