DNS of turbulent flow with hemispherical wall roughness

Mishra, Anand V.; Bolotnov, Igor A.

doi:10.1080/14685248.2014.989231

DNS of turbulent flow with hemispherical wall roughness

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Journal of Turbulence (Online)

DOI:https://doi.org/10.1080/14685248.2014.989231· OSTI ID:1565345

Mishra, Anand V.; Bolotnov, Igor A.

The present study of the effect of roughness density on the mean flow turbulence parameters is motivated by the need for new generation of boundary conditions for multiphase computational multiphase fluid dynamics (CMFD) models applied to boiling flows. Effect of roughness element density on the turbulent flow in a channel is quantified through direct numerical simulations (DNSs). The Navier--Stokes equations are solved using finite element method and bubbles are approximated as rigid near-hemispherical obstacles at the wall. Six different cases were analysed including channel flow with smooth wall and channel flow with rough wall for five different bubble nucleation site densities. Friction factor and the law of the wall was calculated and compared with the previously published results. Existing correlations for nucleating bubble site density dependency on a wall heat flux were used to obtain a relation between the heat flux and the friction factor, leading to the law of the wall dependency on the heat flux. This separate effect study provides new guidelines on how the heat flux in subcooled boiling regime affects the turbulence behaviour near the wall and guides the computational fluid dynamics model development for boiling two-phase flows.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States)

Sponsoring Organization:: DOE Office of Science; USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1565345

Journal Information:: Journal of Turbulence (Online), Journal Name: Journal of Turbulence (Online) Journal Issue: 3 Vol. 16; ISSN 1468-5248

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

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