A micro-porous wall model for micro-blowing/suction flow system

2014 ◽  
Vol 44 (2) ◽  
pp. 221
Author(s):  
Jian LI ◽  
Juan SHEN ◽  
ChunHian LEE
Keyword(s):  
Flow System ◽  
Porous Wall ◽  
Wall Model ◽  
Suction Flow

scholarly journals Duplicate Analysis of Cortisol for Stress Check Using QCM with a Self–suction Flow System

2014 ◽  
Vol 87 ◽  
pp. 296-299 ◽  
Author(s):  
Takeshi Ito ◽  
Nobuyoshi Aoki ◽  
Wakako Shinobu ◽  
Koji Suzuki
Keyword(s):  
Flow System ◽  
Suction Flow

scholarly journals A Physiologic Model for the Problem of Blood Flow through Diseased Blood Vessels

2016 ◽  
Vol 5 (2) ◽  
pp. 58
Author(s):  
Sapna Ratan Shah ◽  
S. U. Siddiqui
Keyword(s):  
Blood Flow ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Shape Parameter ◽  
Fluid Model ◽  
Porous Wall ◽  
Volumetric Flow Rate ◽  
Wall Model ◽  
Flow Through ◽  
Wall Shear

This study focuses on the behavior of blood flow through diseased artery in the presence of porous effects. The laminar, incompressible, fully developed, non-Newtonian in an artery having axially non-symmetric but radially symmetric stenosis is numerically studied. Here blood is represented as Herschel-Bulkley fluid model and flow model is shown by the Navier-Stokes and the continuity equations. Using appropriate boundary conditions, numerical expression for volumetric flow rate, pressure drop and wall shear stress have been derived. The expressions are computed numerically and results are presented graphically. The effects of porous parameter on wall shear stress, stenosis length, stenosis size and stenosis shape parameter are discussed. The wall shear stress increases as the porous parameter, stenosis size and stenosis length increases, but as the stenosis shape parameter increases, the wall shear stress decreases. The work shows that the results obtained from the porous wall model are significantly different from those obtained by the rigid wall model.

Evaluation of Wall-Interference Correction Method Using Numerical Analysis and Porous Wall Model

2015 ◽  
Vol 52 (1) ◽  
pp. 226-234 ◽  
Author(s):  
Taisuke Nambu ◽  
Atsushi Hashimoto ◽  
Makoto Ueno ◽  
Keiichi Murakami ◽  
Tetsuya Sato
Keyword(s):  
Numerical Analysis ◽  
Porous Wall ◽  
Correction Method ◽  
Wall Model ◽  
Interference Correction

Numerical Validation of a Time Domain Perforated Plate Model with Nonlinear and Inertial Effects

2014 ◽  
Vol 22 (04) ◽  
pp. 1450009 ◽  
Author(s):  
Guillaume Jourdain ◽  
Lars-Erik Eriksson
Keyword(s):  
Unsteady Flow ◽  
Time Domain ◽  
Solid Wall ◽  
Perforated Plate ◽  
Porous Wall ◽  
Face Sheet ◽  
Inertial Effects ◽  
Plate Model ◽  
Wall Model ◽  
Numerical Validation

A time domain perforated plate model based on the "homogenization" concept is presented; the dynamic porous wall model. This model takes into account linear and nonlinear losses as well as inertial effects due to the unsteady flow in the vicinity of the holes. A numerical validation of the dynamic porous wall model is performed via the computation of the impedance versus frequency for an acoustic liner consisting of a solid wall back sheet and a perforated face sheet, separated by a given distance. Two types of unsteady flow are considered; firstly 3D LES in which the holes in the perforated face sheet are fully resolved, and secondly 2D URANS simulations in which the dynamic porous wall model is used to include the effects of the perforated face sheet. Comparisons of the results show that the new dynamic porous wall model captures both nonlinear and inertial effects well.

CFD Simulations of Full Surface Passive Effusion Mass Injections in a Rectangular S-Bend Diffuser

2013 ◽  
Author(s):  
B. C. N. Ng ◽  
A. M. Birk
Keyword(s):  
Perforated Plate ◽  
Internal Flow ◽  
Porous Wall ◽  
Ambient Air ◽  
Duct Flow ◽  
Cfd Simulations ◽  
Wall Model ◽  
Ansys Fluent ◽  
Free Surfaces ◽  
Mass Flow Rates

A coarse grid CFD methodology was employed to simulate internal flow passages with full coverage effusion cooling by imposing momentum sinks on effusion cooled surfaces based on a perforated plate pressure loss analogy. The methodology was implemented by specifying 1D Porous Jump boundary conditions (available in ANSYS FLUENT) on the effusion cooled surfaces. Numerical simulations were conducted based on the experimental data of an S-duct diffusing passage where ambient air was passively drawn into the sub-atmospheric passage along the different effusion surfaces with 1 mm diameter holes spaced 4 mm apart. The porous wall simulations were also compared to an alternative CFD approach with mass inlet boundary specified on the effusion surfaces. The proposed porous wall model is promising for practical design applications with the reasonable simulations of the S-duct flow fields with effusion injections. A reasonable accuracy in the results of injection mass flow rates was also obtained for the different effusion configurations. Discrepancies in the simulations of flow momentum components were mainly contributed to the diminishing effects of discrete injections at the aft-section of cooling surface due to the development of a shear layer across the free surfaces (porous jump boundaries) between the main flow and coolant flow.

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