Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

DNS of turbulent flow with hemispherical wall roughness

Journal Article · · Journal of Turbulence (Online)

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

References (23)

Direct numerical simulation of turbulent channel flow up to Reτ=590 journal April 1999
Effect of bubble deformability in turbulent bubbly upflow in a vertical channel journal April 2008
Oscillatory boundary layer close to a rough wall journal March 2009
Influence of Bubbles on the Turbulence Anisotropy journal April 2013
Direct numerical simulation of turbulent channel flows using a stabilized finite element method journal April 2009
The simulation of multidimensional multiphase flows journal May 2005
Heat transport in bubbling turbulent convection journal May 2013
Hydrodynamic simulation of air bubble implosion using a level set approach journal June 2006
Cardiovascular flow simulation at extreme scale journal December 2009
The prediction of laminarization with a two-equation model of turbulence journal February 1972
DNS of turbulent flow in a rod-roughened channel journal June 2004
A stabilized finite element method for computing turbulence journal May 1999
On the interaction between dynamic model dissipation and numerical dissipation due to streamline upwind/Petrov–Galerkin stabilization journal March 2005
A stabilized finite element method for the incompressible Navier-Stokes equations using a hierarchical basis journal January 2001
Turbulent flow in Pipes, with Particular Reference to the Transition Region Between the Smooth and Rough pipe Laws. journal February 1939
Onset of Nucleate Boiling and Active Nucleation Site Density During Subcooled Flow Boiling journal July 2002
Bubbling reduces intermittency in turbulent thermal convection journal March 2014
Detached direct numerical simulations of turbulent two-phase bubbly channel flow journal July 2011
Efficient anisotropic adaptive discretization of the cardiovascular system journal August 2006
An experimental and numerical study of channel flow with rough walls journal January 1999
Balance of Liquid-phase Turbulence Kinetic Energy Equation for Bubble-train Flow journal March 2004
Spectral analysis of turbulence based on the DNS of a channel flow journal April 2010
Nucleation Site Density in Forced Convection Boiling journal February 1993

Similar Records

Turbulence analysis of rough wall channel flows based on direct numerical simulation
Conference · Sun Jul 01 00:00:00 EDT 2012 · OSTI ID:22107860

DNS and LES of turbulent flow in a closed channel featuring a pattern of hemispherical roughness elements
Journal Article · Thu Mar 05 23:00:00 EST 2015 · International Journal of Heat and Fluid Flow · OSTI ID:1565297

A Digital Photographic Study on Nucleate Boiling in Subcooled Flow for Water and Refrigerant 134a Fluids
Conference · Mon Jul 01 00:00:00 EDT 2002 · OSTI ID:21072800

Related Subjects