Efficacy of the FDA nozzle benchmark and the lattice Boltzmann method for the analysis of biomedical flows in transitional regime

05/14/2020
by   Kartik Jain, et al.
0

Flows through medical devices as well as in anatomical vessels despite being at moderate Reynolds number may exhibit transitional or even turbulent character. In order to validate numerical methods and codes used for biomedical flow computations, the U.S. food and drug administration (FDA) established an experimental benchmark, which was a pipe with gradual contraction and sudden expansion representing a nozzle. The experimental results for various Reynolds numbers ranging from 500 to 6500 were publicly released. Previous and recent computational investigations of flow in the FDA nozzle found limitations in various CFD approaches and some even questioned the adequacy of the benchmark itself. This communication reports the results of a lattice Boltzmann method (LBM) based direct numerical simulation (DNS) approach applied to the FDA nozzle benchmark for transitional cases of Reynolds numbers 2000 and 3500. The goal is to evaluate if a simple off the shelf LBM would predict the experimental results without the use of complex models or synthetic turbulence at the inflow. LBM computations with various spatial and temporal resolutions are performed - in the extremities of 44 million to 2.8 billion lattice cells - conducted respectively on 32 CPU cores of a desktop to more than 300'000 cores of a modern supercomputer to explore and characterize miniscule flow details and quantify Kolmogorov scales. The LBM simulations transition to turbulence at a Reynolds number 2000 like the FDA's experiments and acceptable agreement in jet breakdown locations, average velocity, shear stress and pressure is found for both the Reynolds numbers.

READ FULL TEXT
research
08/06/2022

Preconditioned Central Moment Lattice Boltzmann Method on a Rectangular Lattice Grid for Accelerated Computations of Inhomogeneous Flows

Convergence acceleration of flow simulations to their steady states at l...
research
05/17/2023

Scalable Flow Simulations with the Lattice Boltzmann Method

The primary goal of the EuroHPC JU project SCALABLE is to develop an ind...
research
06/02/2023

Study of the convergence of the Meshless Lattice Boltzmann Method in Taylor-Green and annular channel flows

The Meshless Lattice Boltzmann Method (MLBM) is a numerical tool that re...
research
02/15/2023

General fourth order Chapman-Enskog expansion of lattice Boltzmann schemes

In order to derive the equivalent partial differential equations of a la...
research
12/03/2022

Binary mixture flow with free energy lattice Boltzmann methods

We use free energy lattice Boltzmann methods (FRE LBM) to simulate shear...
research
08/04/2017

Multiphase Aluminum A356 Foam Formation Process Simulation Using Lattice Boltzmann Method

Shan-Chen model is a numerical scheme to simulate multiphase fluid flows...

Please sign up or login with your details

Forgot password? Click here to reset