scholarly journals Multi-flexible fiber flows: A direct-forcing immersed boundary lattice-Boltzmann lattice-spring approach

2018 ◽  
Vol 99 ◽  
pp. 408-422 ◽  
Author(s):  
Yihsin Tang ◽  
Tai-Hsien Wu ◽  
Guo-Wei He ◽  
Dewei Qi
Keyword(s):  
Lattice Boltzmann ◽  
Immersed Boundary ◽  
Flexible Fiber ◽  
Direct Forcing ◽  
Boltzmann Lattice

Immersed Boundary – Thermal Lattice Boltzmann Methods for Non-Newtonian Flows Over a Heated Cylinder: A Comparative Study

2015 ◽  
Vol 18 (2) ◽  
pp. 489-515 ◽  
Author(s):  
A. Amiri Delouei ◽  
M. Nazari ◽  
M. H. Kayhani ◽  
S. Succi
Keyword(s):  
Lattice Boltzmann ◽  
Computational Cost ◽  
Shear Thickening ◽  
The Body ◽  
Sharp Interface ◽  
Immersed Boundary ◽  
Heated Cylinder ◽  
Hydrodynamic Approach ◽  
Direct Forcing ◽  
Thermal Lattice Boltzmann

AbstractIn this study, we compare different diffuse and sharp interface schemes of direct-forcing immersed boundary — thermal lattice Boltzmann method (IB-TLBM) for non-Newtonian flow over a heated circular cylinder. Both effects of the discrete lattice and the body force on the momentum and energy equations are considered, by applying the split-forcing Lattice Boltzmann equations. A new technique based on predetermined parameters of direct forcing IB-TLBM is presented for computing the Nusselt number. The study covers both steady and unsteady regimes (20<Re<80) in the power-law index range of 0.6<n<1.4, encompassing both shear-thinning and shear-thickening non-Newtonian fluids. The numerical scheme, hydrodynamic approach and thermal parameters of different interface schemes are compared in both steady and unsteady cases. It is found that the sharp interface scheme is a suitable and possibly competitive method for thermal-IBM in terms of accuracy and computational cost.

Inclusion of Heat Transfer on Settling Behavior of Elliptical Particles: Immersed Boundary-Thermal Lattice Boltzmann Method

2019 ◽  
Author(s):  
Sajjad Karimnejad ◽  
Amin Amiri Delouei ◽  
Mohsen Nazari ◽  
Mohammad Mohsen Shahmardan ◽  
Goodarz Ahmadi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Immersed Boundary ◽  
Complementary Method ◽  
Elliptical Particles ◽  
Direct Forcing ◽  
Boltzmann Method ◽  
Thermal Lattice Boltzmann ◽  
Settling Behavior

Abstract In this study, the hybrid immersed boundary-thermal lattice Boltzmann method was developed and applied to assess the inclusion of heat transfer in flows containing non-circular particles. The direct forcing/heating immersed boundary method was used for determining the hydrodynamic forces and energy exchange. A complementary method was also implemented to treat non-circularity. The accuracy of the computational model and the employed complementary method were properly validated. Two cases for the falling ellipse were considered. A set of comprehensive simulations were performed and the effects of geometry, Grashof number, repulsive force, and heat transfer were analyzed. The findings of this study would be useful for a better understanding of settling non-circular particles in a thermal field.

A CUDA-Based Implementation of a Fluid-Solid Interaction Solver: The Immersed Boundary Lattice-Boltzmann Lattice-Spring Method

2018 ◽  
Vol 23 (4) ◽  
Author(s):  
Tai-Hsien Wu ◽  
Mohammadreza Khani Khani ◽  
Lina Sawalha ◽  
James Springstead ◽  
John Kapenga ◽  
...  
Keyword(s):  
Lattice Boltzmann ◽  
Immersed Boundary ◽  
Spring Method ◽  
Fluid Solid Interaction ◽  
Boltzmann Lattice

Particulate Flow Simulation by the Immersed Boundary Lattice Boltzmann Method

2011 ◽  
Author(s):  
Takeshi Seta
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Flow Simulation ◽  
Correction Method ◽  
Body Motion ◽  
Immersed Boundary ◽  
Cylindrical Couette Flow ◽  
Direct Forcing ◽  
Boltzmann Method ◽  
Direct Forcing Method

We demonstrate the applicability of the immersed boundary lattice Boltzmann method (IB-LBM) based on the implicit correction method to the simulation of rigid body motion in a viscous fluid and to the natural convection calculation. We compare the accuracy of the IB-LBM based on the implicit correction method with one of the IB-LBM based on the direct forcing method that eliminates the necessity of the determination of free parameters. In the simulations of the cylindrical Couette flow and of the heat transfer between two concentric cylinders, the implicit correction method indicates the first-order accuracy in the number of Lagrangian points. The accuracy of the IB-LBM based on the direct forcing method is independent of the number of the boundary points. The IB-LBM based on the implicit correction method is more accurate than one based on the direct forcing method.

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