English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Spatial and spectral energy exchanges associated with the turbulence kineticenergy per unit mass, or half-trace of the velocity covariance tensor, arestudied in an anisothermal low Mach number turbulent channel flow. Thetemperatures of the two channel walls are 293 K and 586 K. This generates astrong temperature gradient in the wall-normal direction. The effect of thetemperature gradient on the energy exchanges is investigated using two directnumerical simulations of the channel, at the mean friction Reynolds numbers 180and 395. The temperature gradient creates an asymmetry between the energyexchanges at the hot and cold sides, due to the variations of the local fluidproperties and low Reynolds number effects. The low Reynolds number effects aresmaller at higher Reynolds number, reducing the asymmetry between the hot andcold sides. We also decomposed the energy exchanges in order to studyseparately the mean-property terms, as found in the constant-propertyisothermal case, and the thermal terms, specific to flows with variable fluidproperties. The significant thermal terms have a similar effect on the flow.Besides, low Reynolds number effects have a negligible impact on thermal termsand only affect mean-property terms.

Effect of the Reynolds number on turbulence kinetic energy exchanges in flows with highly variable fluid properties