A simple numerical method to simulate the flow through filter media: investigation of different fibre allocation algorithms

2021 ◽  
Author(s):  
Liliana Luca Xavier Augusto ◽  
Paolo Tronville ◽  
José Antônio Silveira Gonçalves ◽  
Gabriela Cantarelli Lopes
Keyword(s):  
Numerical Method ◽  
Filter Media ◽  
Flow Through ◽  
Allocation Algorithms

scholarly journals A numerical method for simulating fluid flow through 3-D fracture networks

2016 ◽  
Vol 33 ◽  
pp. 1271-1281 ◽  
Author(s):  
Na Huang ◽  
Yujing Jiang ◽  
Bo Li ◽  
Richeng Liu
Keyword(s):  
Fluid Flow ◽  
Numerical Method ◽  
Fracture Networks ◽  
Flow Through

scholarly journals Blood Damage Through a Bileaflet Mechanical Heart Valve: A Quantitative Computational Study Using a Multiscale Suspension Flow Solver

2014 ◽  
Vol 136 (10) ◽  
Author(s):  
B. Min Yun ◽  
Cyrus K. Aidun ◽  
Ajit P. Yoganathan
Keyword(s):  
Numerical Method ◽  
Heart Valves ◽  
Computational Study ◽  
Mechanical Heart Valve ◽  
Complex Flow ◽  
Damage Potential ◽  
Spatiotemporal Resolution ◽  
Jude Medical ◽  
Blood Damage ◽  
Flow Through

Bileaflet mechanical heart valves (BMHVs) are among the most popular prostheses to replace defective native valves. However, complex flow phenomena caused by the prosthesis are thought to induce serious thromboembolic complications. This study aims at employing a novel multiscale numerical method that models realistic sized suspended platelets for assessing blood damage potential in flow through BMHVs. A previously validated lattice-Boltzmann method (LBM) is used to simulate pulsatile flow through a 23 mm St. Jude Medical (SJM) Regent™ valve in the aortic position at very high spatiotemporal resolution with the presence of thousands of suspended platelets. Platelet damage is modeled for both the systolic and diastolic phases of the cardiac cycle. No platelets exceed activation thresholds for any of the simulations. Platelet damage is determined to be particularly high for suspended elements trapped in recirculation zones, which suggests a shift of focus in blood damage studies away from instantaneous flow fields and toward high flow mixing regions. In the diastolic phase, leakage flow through the b-datum gap is shown to cause highest damage to platelets. This multiscale numerical method may be used as a generic solver for evaluating blood damage in other cardiovascular flows and devices.

scholarly journals DETERMINING THE EFFECT OF NOZZLE GROOVE ON THE FLUID FLOW THROUGH VISCOUS 2D PLANAR FLUID

2021 ◽  
pp. 1-8
Author(s):  
Obai Younis ◽  
Reem Ahmed ◽  
Ali Hamdan ◽  
Dania Ahmed ◽  
Ali Ahmed ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Numerical Method ◽  
Surface Area ◽  
Nozzle Exit ◽  
New Approach ◽  
Numerical Stimulation ◽  
Flow Through ◽  
Different Dimensions ◽  
The One

The study aims to determine the effect of nozzle groove on fluid flow through viscous 2D planar fluid. To fulfil the study’s aim, numerical method was adopted to introduce grooves of different dimensions from the nozzle exit. The study adopts SoldWork software was used to design nozzles and introduce groove shaped nozzles, each consisting of six different designs. The nozzle base model used in this study was similar to the one used in a previous study. The procedure was performed with different pressures (8, 10, and 12 bar) at the similar firefighting nozzle. The velocities contours were predicted based on the choice of nozzle section during the numerical stimulation. The results of present study demonstrated a new approach that can be used for increasing velocity at various types of modified nozzles through grooves at different pressures and locations. For grooves, dimensions 1×1 (mm) and location 15 mm at 8 bar, 10 bar and 12 bars showed no effect on velocity as it reduces velocity by increasing surface area. The velocity increases with increasing pressure in proportion relationship. This clearly explains that the groove has no effect on velocity as it increases due to increase in pressure. This is because the groove reduces the velocity by increasing surface area. The study concludes that use of groove increases velocity of water that further improves nozzles operation.

A Numerical Method for Turbomachinery Aeroelasticity

2002 ◽  
Author(s):  
P. Cinnella ◽  
P. De Palma ◽  
G. Pascazio ◽  
M. Napolitano
Keyword(s):  
Numerical Method ◽  
Compressible Flows ◽  
State Of The Art ◽  
Second Order ◽  
The State ◽  
Turbine Cascade ◽  
Time Step ◽  
Difference Formula ◽  
Standard Configuration ◽  
Flow Through

This work provides an accurate and efficient numerical method for turbomachinery flutter. The unsteady Euler or Reynolds-averaged Navier–Stokes (RANS) equations are solved in integral form, the blade passages being discretised using a background fixed C-grid and a body-fitted C-grid moving with the blade. In the overlapping region data are exchanged between the two grids at every time step, using bilinear interpolation. The method employs Roe’s second-order-accurate flux difference splitting scheme for the inviscid fluxes, a standard second-order discretisation of the viscous terms, and a three-level backward difference formula for the time derivatives. The state-of-the-art second-order accuracy of numerical methods for unsteady compressible flows with shocks is thus carried over, for the first time to the authors knowledge, to flutter computations. The dual time stepping technique is used to evaluate the nonlinear residual at each time step, thus extending to turbomachinery aeroelasticity the state-of-the-art efficiency of unsteady RANS solvers. The code is proven to be accurate and efficient by computing the 4th Aeroelastic Standard Configuration, namely, the subsonic flow through a turbine cascade with flutter instability in the first bending mode, where viscous effect are found practically negligible. Then, the very severe 11th Aeroelastic Standard Configuration is computed, namely, the transonic flow through a turbine cascade at off-design conditions, where the turbulence model is found to be the critical feature of the method.

Numerical Computation of Transonic Potential Flow Through Nozzles

1981 ◽  
Vol 32 (1) ◽  
pp. 31-42 ◽  
Author(s):  
T.J. Baker
Keyword(s):  
Experimental Data ◽  
Computer Program ◽  
Numerical Method ◽  
Numerical Computation ◽  
Potential Flow ◽  
Axisymmetric Nozzle ◽  
Flow Through

SummaryA numerical method for computing potential flow through either a planar or axisymmetric nozzle is described. Some results obtained from a computer program based on this method are presented and compared with experimental data.

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