Direct numerical simulation of non-isothermal flow through dense bidisperse random arrays of spheres

2017 ◽  
Vol 314 ◽  
pp. 291-298 ◽  
Author(s):  
H. Tavassoli ◽  
E.A.J.F. Peters ◽  
J.A.M. Kuipers
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Isothermal Flow ◽  
Random Arrays ◽  
Flow Through ◽  
Arrays Of Spheres

Direct Numerical Simulation on a Cartesian Mesh of the Flow through a Tube Bundle

2004 ◽  
Vol 18 (1) ◽  
pp. 1-14 ◽  
Author(s):  
C. Moulinec ◽  
M.J.B.M. Pourquié† ◽  
B.J. Boersma‡ ◽  
T. Buchal¶,§ ◽  
F.T.M. Nieuwstadt∥
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Tube Bundle ◽  
Cartesian Mesh ◽  
Flow Through

scholarly journals Application of Direct Numerical Simulation to Determine the Correlation Describing Friction Losses during the Transverse Flow of Fluid in Hexagonal Array Pin Bundles

Fluids ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 22
Author(s):  
Yury Shvetsov ◽  
Yury Khomyakov ◽  
Mikhail Bayaskhalanov ◽  
Regina Dichina
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Pressure Drop ◽  
Liquid Metal ◽  
Direct Numerical Simulation ◽  
Incompressible Fluid ◽  
Reactor Core ◽  
Transverse Flow ◽  
Hexagonal Array ◽  
Flow Through

This paper presents the results of a numerical simulation to determine the hydraulic resistance for a transverse flow through the bundle of hexagonal rods. The calculations were carried out using the precision CFD code CONV-3D, intended for direct numerical simulation of the flow of an incompressible fluid (DNS-approximation) in the parts of fast reactors cooled by liquid metal. The obtained dependencies of the pressure drop and the coefficient of anisotropy of friction on the Reynolds number can be used in the thermal-hydraulic codes that require modeling of the flow in similar structures and, in particular, in the inter-wrapper space of the reactor core.

Direct Numerical Simulation of Cellular Blood Flow Through a Model Arteriole Bifurcation

2010 ◽  
Author(s):  
Daniel A. Reasor ◽  
Jonathan R. Clausen ◽  
Cyrus K. Aidun
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Direct Numerical Simulation ◽  
Volume Fraction ◽  
Flow Characteristics ◽  
Particle Level ◽  
Suspension Dynamics ◽  
Flow Through ◽  
Fahraeus Effect ◽  
The Continuum

Blood is composed of a suspension of red blood cells (RBCs) suspended in plasma, and the presence of the RBCs substantially changes the flow characteristics and rheology of these suspensions. The viscosity of blood varies with the hematocrit (volume fraction of RBCs), which is a result not seen in Newtonian fluids. Additionally, RBCs are deformable, which can alter suspension dynamics. Understanding the physics in these flows requires accurately simulating the suspended phase to recover the microscale, and a subsequent analysis of the rheology to ascertain the continuum-level effects caused by the changes at the particle level. The direct numerical simulation of blood flow including RBC migration effects has the capability to resolve the Fåhraeus effect of observing low hematocrit values near walls, the subsequent cell-depleted layer, and the presence of velocity profile blunting due to the distribution of RBCs.

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