Modeling Flow Through and Around a Net Panel Using Computational Fluid Dynamics

OCEANS 2006 ◽  
2006 ◽  
Author(s):  
Oystein Patursson ◽  
M. Swift ◽  
Kenneth Baldwin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Through ◽  
Modeling Flow

scholarly journals A Simple Transient Poiseuille-Based Approach to Mimic the Womersley Function and to Model Pulsatile Blood Flow

Dynamics ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 9-17
Author(s):  
Andrea Natale Impiombato ◽  
Giorgio La Civita ◽  
Francesco Orlandi ◽  
Flavia Schwarz Franceschini Zinani ◽  
Luiz Alberto Oliveira Rocha ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Boundary Conditions ◽  
Quadratic Function ◽  
Pulsatile Blood Flow ◽  
Flow Through ◽  
Simplified Analysis ◽  
Function Models ◽  
Flow Reversals

As it is known, the Womersley function models velocity as a function of radius and time. It has been widely used to simulate the pulsatile blood flow through circular ducts. In this context, the present study is focused on the introduction of a simple function as an approximation of the Womersley function in order to evaluate its accuracy. This approximation consists of a simple quadratic function, suitable to be implemented in most commercial and non-commercial computational fluid dynamics codes, without the aid of external mathematical libraries. The Womersley function and the new function have been implemented here as boundary conditions in OpenFOAM ESI software (v.1906). The discrepancy between the obtained results proved to be within 0.7%, which fully validates the calculation approach implemented here. This approach is valid when a simplified analysis of the system is pointed out, in which flow reversals are not contemplated.

A Numerical and Experimental Investigation of Low-conductivity Unglazed, Transpired Solar Air Heaters

2005 ◽  
Vol 127 (1) ◽  
pp. 153-155 ◽  
Author(s):  
Keith Gawlik ◽  
Craig Christensen ◽  
Charles Kutscher
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Experimental Investigation ◽  
Experimental Work ◽  
Experimental Results ◽  
Flow Conditions ◽  
Numerical Work ◽  
Plate Geometry ◽  
Modeling Flow ◽  
Good Agreement

The performance of low-conductivity unglazed, transpired solar collectors was determined numerically and experimentally. The numerical work consisted of modeling flow conditions, plate geometries, and plate conductivities with modified commercial computational fluid dynamics software, and the experimental work compared the performance of two plate geometries made with high and low conductivity materials under a variety of flow conditions. Good agreement was found between the numerical and experimental results. The results showed that for practical low-conductivity materials, performance differed little from the equivalent plate geometry in high-conductivity material.

An Initial Parametric Study on Fluid Flow Through Bileaflet Mechanical Heart Valves Using Computational Fluid Dynamics

1994 ◽  
Vol 208 (2) ◽  
pp. 63-72 ◽  
Author(s):  
M J King ◽  
T David ◽  
J Fisher
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heart Valve ◽  
Heart Valves ◽  
Mechanical Heart Valve ◽  
Volumetric Flow Rate ◽  
Flow Fields ◽  
Opening Angle ◽  
Bileaflet Mechanical Heart Valve ◽  
Flow Through

The effect of leaflet opening angle on flow through a bileaflet mechanical heart valve has been investigated using computational fluid dynamics (CFD). Steady state, laminar flow for a Newtonian fluid at a Reynolds number of 1500 was used in the two-dimensional model of the valve, ventricle, sinus and aorta. This computational model was verified using one-dimensional laser Doppler velocimetry (LDV). Although marked differences in the flow fields and energy dissipation of the jets downstream of the valve were found between the CFD predictions and the three-dimensional experimental model, both methods showed similar trends in the changes of the flow fields as the leaflet opening angle was altered. As the opening angle increased the area of recirculating fluid downstream of the leaflets, the pressure drop across the valve and the volumetric flow rate through the outer orifice decreased. For opening angles greater than 80° the jet through the outer orifice recombined with the central jet downstream of the leaflet; for an opening angle of 78° the jet through the outer orifice impinged on the aortic wall before recombining with the central jet. This study suggests that the opening angle has a marked effect on the flow downstream of the bileaflet mechanical heart valve and that valves with opening angles greater than 80° are preferable.

scholarly journals Teaching turbulent flow through pipe fittings using computational fluid dynamics approach

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Bhavesh D. Gajbhiye ◽  
Harshawardhan A. Kulkarni ◽  
Shashank S. Tiwari ◽  
Channamallikarjun S. Mathpati
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Turbulent Flow ◽  
Flow Through ◽  
Pipe Fittings

Analysis of the steam condensing flow in a linear blade cascade

2017 ◽  
Vol 232 (5) ◽  
pp. 501-514 ◽  
Author(s):  
Sławomir Dykas ◽  
Mirosław Majkut ◽  
Krystian Smołka ◽  
Michał Strozik
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Model ◽  
Numerical Code ◽  
Heterogeneous Condensation ◽  
Blade Cascade ◽  
Numerical Testing ◽  
Ansys Cfx ◽  
Flow Through ◽  
Last Stage

This study presents experimental and numerical testing of the steam condensing flow through a linear blade cascade made of blades of a 200 MW steam turbine last stage stator. The tests were carried out on an in-house laboratory stand and using an in-house numerical code modelling the water vapour flow with homo- and heterogeneous condensation. Additionally, this paper presents a comparison of calculations of a flow field modelled by means of a single-fluid model using both an in-house computational fluid dynamics code and the commercial Ansys CFX v16.2 software package. The aim of the research was to identify difficulties involved by comparing the numerical modelling results with the experimental data for a linear blade cascade. The experimental results, which are very well supplemented by those obtained from numerical computations, may be used to validate computational fluid dynamics codes.

Modeling Fluid Flow in Angiosperms Xylem Pits

2012 ◽  
Vol 195-196 ◽  
pp. 577-582
Author(s):  
Fang Xu ◽  
Jiao Liao Chen ◽  
Qin Lin Ai ◽  
Qi Chen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Hydraulic Resistance ◽  
Water Flow ◽  
Direct Measurements ◽  
Pit Membrane ◽  
Flow Through ◽  
Simulation Results ◽  
Low K ◽  
Resistance Value

Hydraulic resistance of water flow in the xylem is mainly caused by Pits. Pits between vessels play an important role in the water transport of plant. The pit membrane worked as porous, the water flow through pit is modeled using CFD(Computational fluid dynamics) approach of low k-ε turbulence. Consiedered the deflection of homogeneous membrane affected by pressure difference, the pit hydraulic resistance calculated according to simulation results is consisent with hydraulic resistance value from direct measurements, which indicated that the model can provide reliable estimation the flow of water through pit.

scholarly journals Flow through a Two-Scale Porosity Material

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
A. G. Andersson ◽  
L. G. Westerberg ◽  
T. D. Papathanasiou ◽  
T. Staffan Lundström
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Porous Medium ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Image Velocimetry ◽  
Microparticle Image Velocimetry ◽  
Flow Through ◽  
Element Method

Flow through a two-scale porous medium is here investigated by a unique comparison between simulations performed with computational fluid dynamics and the boundary element method with microparticle image velocimetry in model geometries.

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