An immersed boundary-lattice Boltzmann method with multi relaxation time for solving flow-induced vibrations of an elastic vortex generator and its effect on heat transfer and mixing

2021 ◽  
Vol 405 ◽  
pp. 126652
Author(s):  
Soheil Hosseini ◽  
Saharnaz Aghebatandish ◽  
Abdolrahman Dadvand ◽  
Boo Cheong Khoo
Keyword(s):  
Heat Transfer ◽  
Relaxation Time ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Vortex Generator ◽  
Immersed Boundary ◽  
Flow Induced Vibrations ◽  
Boltzmann Method

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.

scholarly journals Study on Bifurcation and Dual Solutions in Natural Convection in a Horizontal Annulus with Rotating Inner Cylinder Using Thermal Immersed Boundary-Lattice Boltzmann Method

Entropy ◽  
2018 ◽  
Vol 20 (10) ◽  
pp. 733 ◽  
Author(s):  
Yikun Wei ◽  
Zhengdao Wang ◽  
Yuehong Qian ◽  
Wenjing Guo
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Dual Solutions ◽  
Immersed Boundary ◽  
Rotation Effect ◽  
Linear Speed ◽  
Convection Patterns ◽  
Boltzmann Method

A numerical investigation has been carried out to understand the mechanism of the rotation effect on bifurcation and dual solutions in natural convection within a horizontal annulus. A thermal immersed boundary-lattice Boltzmann method was used to resolve the annular flow domain covered by a Cartesian mesh. The Rayleigh number based on the gap width is fixed at 104. The rotation effect on the natural convection is analyzed by streamlines, isotherms, phase portrait and bifurcation diagram. Our results manifest the existence of three convection patterns in a horizontal annulus with rotating inner cylinder which affect the heat transfer in different ways, and the linear speed ( U i * ) determines the proportion of each convection. Comparison of average Nusselt number versus linear speed for the inner cylinder indicates the existence of the three different mechanisms which drive the convection in a rotation system. The convection pattern caused by rotation reduces the heat transfer efficiency. Our results in phase portraits also reveal the differences among different convection patterns.

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