A local domain-free discretization method for simulation of incompressible flows over moving bodies

2011 ◽  
Vol 66 (2) ◽  
pp. 162-182 ◽  
Author(s):  
C. H. Zhou ◽  
C. Shu
Keyword(s):  
Incompressible Flows ◽  
Local Domain ◽  
Discretization Method ◽  
Moving Bodies

SIMULATION OF INCOMPRESSIBLE VISCOUS FLOWS BY BOUNDARY CONDITION-IMPLEMENTED IMMERSED BOUNDARY METHOD

2009 ◽  
Vol 23 (03) ◽  
pp. 345-348
Author(s):  
Q. LI ◽  
C. SHU ◽  
H. Q. CHEN
Keyword(s):  
Immersed Boundary Method ◽  
Incompressible Flows ◽  
Viscous Flows ◽  
Numerical Approach ◽  
Present Approach ◽  
Immersed Boundary ◽  
Solid Boundary ◽  
Local Domain ◽  
Governing Equations ◽  
Boundary Method

A new numerical approach is presented in this work to simulate incompressible flows. The present approach combines the ideas of the conventional immersed boundary method (IBM) for decoupling the solution of governing equations with the solid boundary and the local domain-free discretization (DFD) method for implementation of boundary conditions. Numerical results for simulation of flows around a circular cylinder showed that the present approach can provide accurate solutions effectively.

A Sharp-Interface Immersed Boundary Method for Simulating Incompressible Flows with Arbitrarily Deforming Smooth Boundaries

2017 ◽  
Vol 15 (01) ◽  
pp. 1750080 ◽  
Author(s):  
Zuo Cui ◽  
Zixuan Yang ◽  
Hong-Zhou Jiang ◽  
Wei-Xi Huang ◽  
Lian Shen
Keyword(s):  
Incompressible Flows ◽  
Deformable Body ◽  
Fluid Flows ◽  
Sharp Interface ◽  
Immersed Boundary ◽  
Time Step ◽  
Fluid Forces ◽  
Solid Bodies ◽  
Ib Method ◽  
Moving Bodies

We develop a sharp interface immersed boundary (IB) method to simulate the interactions between fluid flows and deformable moving bodies. Fluid–solid interfaces are captured using a level-set (LS) function, which is updated at every time step by a reinitialization procedure. Motions of solid bodies are dynamically coupled with fluid flows by calculating the fluid forces exerted on solid bodies. The accuracy and robustness of the LS-based IB method are tested systematically in the context of several benchmark cases and self-propelled fish swimming. The effects of computational parameters on the accuracy of deformable body capturing are analyzed. It is found that the algorithm performs well in simulating the flow motions surrounding the deforming and moving bodies.

Multiscale space–time methods for thermo-fluid analysis of a ground vehicle and its tires

2015 ◽  
Vol 25 (12) ◽  
pp. 2227-2255 ◽  
Author(s):  
Kenji Takizawa ◽  
Tayfun E. Tezduyar ◽  
Takashi Kuraishi
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Incompressible Flows ◽  
Exhaust System ◽  
Space Time ◽  
Small Scale ◽  
Local Domain ◽  
Ground Vehicle ◽  
The Core ◽  
Fluid Analysis

We present the core and special multiscale space–time (ST) methods we developed for thermo-fluid analysis of a ground vehicle and its tires. We also present application of these methods to thermo-fluid analysis of a freight truck and its rear set of tires. The core multiscale ST method is the ST variational multiscale (ST-VMS) formulation of the Navier–Stokes equations of incompressible flows with thermal coupling, which is multiscale in the way the small-scale thermo-fluid behavior is represented in the computations. The special multiscale ST method is spatially multiscale, where the thermo-fluid computation over the global domain with a reasonable mesh refinement is followed by a higher-resolution computation over the local domain containing the rear set of tires, with the boundary and initial conditions coming from the data computed over the global domain. The large amount of time-history data from the global computation is stored using the ST computation technique with continuous representation in time (ST-C), which serves as a data compression technique in this context. In our thermo-fluid analysis, we use a road-surface temperature higher than the free-stream temperature, and a tire-surface temperature that is even higher. We also include in the analysis the heat from the engine and exhaust system, with a reasonably realistic representation of the rate by which that heat transfer takes place as well as the surface geometry of the engine and exhaust system over which the heat transfer occurs. We take into account the heave motion of the truck body. We demonstrate how the spatially multiscale ST method, with higher-refinement mesh in the local domain, substantially increases the accuracy of the computed heat transfer rates from the tires.

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