Direct simulation of stably stratified wall-bounded turbulence using the lattice Boltzmann method

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dc.contributor.authorGuo, Junwei
dc.contributor.authorZhou, Qi
dc.contributor.authorWong, Ron Chik-Kwong
dc.date.accessioned2023-05-11T19:39:58Z
dc.date.available2023-05-11T19:39:58Z
dc.date.issued2023-04-27
dc.description.abstractThe lattice Boltzmann method (LBM) is employed to simulate stratified plane Couette (SPC) flows in their statistically stationary turbulent state. The aim is to assess the suitability of the LBM for direct simulation of wall-bounded, sheared turbulence under the influence of stable stratification. The SPC flow is generated by two parallel plates moving in opposite directions with velocities ± U w, and the buoyancy is fixed at ± b w at the upper and lower plates, respectively. The Reynolds number Re = U w h / ν, where h is the half-gap height, and ν is the kinematic viscosity, varies from 1000 to 3000. The Richardson number Ri = b w h / U w 2 is set to 0 or 0.01. The LBM results are compared to direct numerical simulations using the conventional pseudo-spectral method, and good agreement is found in various turbulence statistics, such as mean and fluctuation velocity and buoyancy, Reynolds stress, turbulent heat flux, dissipation rate, wall fluxes of momentum and heat, and longitudinal and transverse turbulence spectra. The results from grid-sensitivity tests indicate that the uniform isotropic grid spacing Δ x in LBM needs to be no greater than approximately the near-wall viscous length scale δ ν to achieve adequate resolution of stratified wall-bounded turbulence.
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)
dc.identifier.issn1070-6631
dc.identifier.issn1089-7666
dc.identifier.urihttp://hdl.handle.net/1880/116526
dc.identifier.urihttps://dx.doi.org/10.11575/PRISM/dspace/41369
dc.language.isoenen
dc.publisher.facultySchulich School of Engineeringen
dc.publisher.hasversionacceptedVersion
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.policyhttps://publishing.aip.org/wp-content/uploads/2022/03/AIPP-Author-License.pdf
dc.relation.ispartofPhysics of Fluids
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en
dc.titleDirect simulation of stably stratified wall-bounded turbulence using the lattice Boltzmann method
dc.typejournal-article
oaire.citation.issue4
oaire.citation.volume35
ucalgary.scholar.levelFaculty
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