Separation and reattachment of non-newtonian fluid flows in a sudden expansion pipe

1990 ◽  
Vol 37 (2-3) ◽  
pp. 175-199 ◽  
Author(s):  
Bockchoon Pak ◽  
Young I. Cho ◽  
Stephen U.S. Choi
Keyword(s):  
Newtonian Fluid ◽  
Fluid Flows ◽  
Sudden Expansion

An implicit scheme for simulation of free surface non-Newtonian fluid flows on dynamically adapted grids

2021 ◽  
Vol 36 (3) ◽  
pp. 165-176
Author(s):  
Kirill Nikitin ◽  
Yuri Vassilevski ◽  
Ruslan Yanbarisov
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Newtonian Fluid ◽  
Viscoelastic Fluid ◽  
Fluid Flows ◽  
Numerical Results ◽  
Implicit Scheme ◽  
New Approach

Abstract This work presents a new approach to modelling of free surface non-Newtonian (viscoplastic or viscoelastic) fluid flows on dynamically adapted octree grids. The numerical model is based on the implicit formulation and the staggered location of governing variables. We verify our model by comparing simulations with experimental and numerical results known from the literature.

A comparison of numerical methods for non-Newtonian fluid flows in a sudden expansion

2016 ◽  
Vol 27 (12) ◽  
pp. 1650139 ◽  
Author(s):  
G.Di Ilio ◽  
D. Chiappini ◽  
G. Bella
Keyword(s):  
Computational Methods ◽  
Numerical Study ◽  
Flow Behavior ◽  
Fluid Flows ◽  
Newtonian Fluids ◽  
Sudden Expansion ◽  
Complex Flows ◽  
Symmetric Channel ◽  
Runge Kutta Method ◽  
Boltzmann Method

A numerical study on incompressible laminar flow in symmetric channel with sudden expansion is conducted. In this work, Newtonian and non-Newtonian fluids are considered, where non-Newtonian fluids are described by the power-law model. Three different computational methods are employed, namely a semi-implicit Chorin projection method (SICPM), an explicit algorithm based on fourth-order Runge–Kutta method (ERKM) and a Lattice Boltzmann method (LBM). The aim of the work is to investigate on the capabilities of the LBM for the solution of complex flows through the comparison with traditional computational methods. In the range of Reynolds number investigated, excellent agreement with the literature results is found. In particular, the LBM is found to be accurate in the prediction of the fluid flow behavior for the problem under consideration.

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