scholarly journals On the Application of Chimera/Unstructured Hybrid Grids for Conjugate Heat Transfer

1996 ◽  
Author(s):  
Kai-Hsiung Kao ◽  
Meng-Sing Liou
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Unstructured Grid ◽  
Grid Method ◽  
Flow Region ◽  
Grid System ◽  
Overset Grid ◽  
Disk System ◽  
Grid Scheme ◽  
Hybrid Grid

A hybrid grid system that combines the Chimera overset grid scheme and an unstructured grid method is developed to study fluid flow and heat transfer problems. With the proposed method, the solid structural region, in which only heat conduction is considered, can be easily represented using an unstructured grid method. As for the fluid flow region external to the solid material, the Chimera overset grid scheme has been shown to be very flexible and efficient in resolving complex configurations. The numerical analyses require the flow field solution and material thermal response to be obtained simultaneously. A continuous transfer of temperature and heat flux is specified at the interface, which combines the solid structure and the fluid flow into an integral system. Numerical results are compared with analytical and experimental data for a flat plate and a C3X cooled turbine cascade. A simplified drum-disk system is also simulated to show the effectiveness of this hybrid grid system.

Transfer of Heat in Rotating Systems

1976 ◽  
Author(s):  
A. D. Gosman ◽  
M. L. Koosinlin ◽  
F. C. Lockwood ◽  
D. B. Spalding
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Fluid Flow ◽  
Rotating Disk ◽  
Experimental Measurements ◽  
Steady Flows ◽  
Disk System ◽  
Rotating Systems ◽  
Flow And Heat Transfer ◽  
Layer Flow

A calculation procedure has been developed for predicting fluid-flow and heat-transfer phenomena in axisymmetrical, rotating, turbulent, steady flows, with special reference to those mainly confined within cavities. The procedure has been used for predicting boundary-layer flow between a rotating disk and a stationary one, and flow and heat transfer in a shrouded-disk system. Agreement with experimental measurements is satisfactory.

Fluid Flow and Heat Transfer Over a Three-Dimensional Spherical Object in a Pipe

1998 ◽  
Vol 120 (4) ◽  
pp. 985-990 ◽  
Author(s):  
N. Shahcheraghi ◽  
H. A. Dwyer
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Pipe Wall ◽  
Three Dimensional ◽  
Governing Equations ◽  
Sphere Surface ◽  
Spherical Object ◽  
Number Range ◽  
Flow And Heat Transfer ◽  
Grid Scheme

An incompressible viscous fluid flow with heat transfer over a spherical object inside a pipe is considered. The flow is made three-dimensional by an eccentric positioning of the sphere inside the pipe. The governing equations are solved by a numerical method which uses a finite volume formulation in a generalized body fitted coordinate system. An overset (Chimera) grid scheme is used to resolve the two geometries of the pipe and sphere. The results are compared to those of an external flow over a sphere, and the code is validated using such results in the intermediate Reynolds number range. The blockage effects are analyzed through evaluation of lift, drag, and heat transfer rate over the sphere. Also the change in the shear stress pattern is examined through evaluation of the local friction factor on a pipe wall and sphere surface.

Introduction of Combined Usage of Overset Grid Method in Conjugate Heat Transfer Simulation

2009 ◽  
Author(s):  
Takashi Yamane ◽  
Kazuomi Yamamoto
Keyword(s):  
Heat Transfer ◽  
Turbine Blade ◽  
Conjugate Heat Transfer ◽  
Grid Method ◽  
Grid Generation ◽  
Computational Grids ◽  
Overset Grid ◽  
Overset Grid Method ◽  
Background Grid ◽  
Heat Transfer Simulation

The conjugate heat transfer simulation is expected to simulate precise temperature distributions of turbine cooling structures and contribute to the reduction of cooling air usage. However, the generation of computational grids for highly complicated cooling structures in turbine blade is a quite difficult work, especially in the conjugate simulation because grids for fluid and solid regions should be generated simultaneously. In this study the combined usage of the overset grid method with the attached multiblock grid method is introduced for the grid generation with less effort. In the original UPACS flow solver, the overset is treated as one type of boundary conditions where the data are interpolated from the background grid blocks. If the interpolations of data are allowed along the solid surface which is the connecting boundary of fluid and solid grid blocks, the heat flux calculation becomes quite complicated and the benefits of longstanding researches on the turbulence models for boundary fitted grids cannot be used, thus the overset treatments have been limited among the same type of calculation blocks, that is, the fluid blocks should be on the background grid of fluid region and the solid blocks should be on the background grid of solid region. The procedure to create grids with the above restriction has also developed. Numerical result using the overset grid method is compared with the conventional multi-block grid result for evaluation. With this method, the grid generation labor for such as parametric simulations of different arrangements of film holes in a turbine blade will be greatly reduced.

Mathematical simulation of heat transfer during fluid flow for a fuel element with a polyzonal finned shell

2017 ◽  
Vol 20 (4) ◽  
pp. 58-63
Author(s):  
K. Maksymenko-Sheiko ◽  
◽  
Yu. Litvinova ◽  
T. Sheyko ◽  
M. Khazhmuradov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Fuel Element ◽  
Mathematical Simulation

A Parametric Numerical Study of Fluid Flow and Heat Transfer in a Computer Chassis

2015 ◽  
Vol 9 (3) ◽  
pp. 242 ◽  
Author(s):  
Efstathios Kaloudis ◽  
Dimitris Siachos ◽  
Konstantinos Stefanos Nikas
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Study ◽  
Flow And Heat Transfer
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