Application of the hybrid Local Domain Free Discretization and Immersed Boundary Method (LDFD-IBM) to simulate moving boundary flow problems

2018 ◽  
Vol 161 ◽  
pp. 111-120 ◽  
Author(s):  
Yan Ling Wu
Keyword(s):  
Immersed Boundary Method ◽  
Moving Boundary ◽  
Immersed Boundary ◽  
Local Domain ◽  
Boundary Flow ◽  
Flow Problems ◽  
Boundary Method

Simulation of Incompressible Viscous Flows by Local DFD-Immersed Boundary Method

2012 ◽  
Vol 4 (03) ◽  
pp. 311-324 ◽  
Author(s):  
Y. L. Wu ◽  
C. Shu ◽  
H. Ding
Keyword(s):  
Immersed Boundary Method ◽  
Stokes Equations ◽  
Viscous Flows ◽  
Slip Boundary Condition ◽  
Present Approach ◽  
Immersed Boundary ◽  
Local Domain ◽  
Slip Boundary ◽  
Incompressible Viscous Flows ◽  
Boundary Method

AbstractA local domain-free discretization-immersed boundary method (DFD-IBM) is presented in this paper to solve incompressible Navier-Stokes equations in the primitive variable form. Like the conventional immersed boundary method (IBM), the local DFD-IBM solves the governing equations in the whole domain including exterior and interior of the immersed object. The effect of immersed boundary to the surrounding fluids is through the evaluation of velocity at interior and exterior dependent points. To be specific, the velocity at interior dependent points is computed by approximate forms of solution and the velocity at exterior dependent points is set to the wall velocity. As compared to the conventional IBM, the present approach accurately implements the non-slip boundary condition. As a result, there is no flow penetration, which is often appeared in the conventional IBM results. The present approach is validated by its application to simulate incompressible viscous flows around a circular cylinder. The obtained numerical results agree very well with the data in the literature.

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.

Application of Combination of Local Domain Free Discretization and Immersed Boundary Method (LDFD-IBM) to Numerical Simulation of 3D Flows Over a Circular Cylinder

2014 ◽  
Author(s):  
Yanling Wu ◽  
Chang Shu ◽  
Johan Gullman-Strand
Keyword(s):  
Circular Cylinder ◽  
Immersed Boundary Method ◽  
Adaptive Mesh Refinement ◽  
Solid Wall ◽  
Three Dimensional ◽  
Immersed Boundary ◽  
Local Domain ◽  
Cartesian Mesh ◽  
Boundary Method ◽  
Dimensional Version

In this paper, the recent developed Local Domain Free Discretization method combined with Immersed Boundary Method (called LDFD-IBM) is extended from two-dimensional version to three-dimensional version. LDFD-IBM is a new member in the family of Cartesian mesh methods. The advantages of LDFD-IBM over other Cartesian mesh solvers includes: no cutting cell, easy to adaptive mesh refinement, easy to implement for moving boundary problems, truly second order accuracy over whole domain, no flow penetration into the solid wall. LDFD-IBM three-dimensional solver is then used to simulate three-dimensional flow past a circular cylinder. Both oblique mode and parallel mode of vortex shedding of the cylinder in three-dimensional configuration are reproduced according to different end-conditions. Oblique shedding is one of the important three-dimensional features that could influence the amplitude, frequency and phase of the flow-induced forces.

Immersed Boundary Method for CFD Analysis of Moving Boundary Problems in OpenFOAM

2015 ◽  
Author(s):  
Krishna M. Singh ◽  
Norihiko Nonaka ◽  
U. Oh
Keyword(s):  
Immersed Boundary Method ◽  
Moving Boundary ◽  
Numerical Solutions ◽  
Numerical Results ◽  
Immersed Boundary ◽  
Moving Boundary Problems ◽  
Boundary Problems ◽  
Immersed Surfaces ◽  
Computational Performance ◽  
Boundary Method

CFD simulation of hydraulic equipments involving moving boundary components is really challenging due to difficulty in maintaining a good quality mesh essential for obtaining accurate numerical solutions. To deal with these problems, commercial codes such as Ansys CFX provide the option of mesh morphing which must be used in conjunction with pre-defined multiple grid configurations to account for changing flow domain. In contrast to this approach, immersed boundary method (IBM) provides an attractive alternative in which the complex moving surface is immersed in a fixed Cartesian (or polyhedral) grid. We have developed an immersed boundary simulation tool-kit for moving boundary problems based on OpenFOAM. It requires the user to provide the definition of the immersed surfaces in STL (stereolithography) format, type of flow (internal/external) and motion (stationary, pre-defined or flow-induced) of the surface. Numerical simulations have been performed for selected test cases to assess the computational performance of the immersed boundary too-kit. Numerical results of flow over stationary as well as vibrating cylinders agree very well with available experimental and numerical results, and show that the immersed boundary simulations accurately capture the vortex shedding frequency and vortical structures for moving boundary problems.

Numerical simulation of continuous casting of steel alloy for different cooling ambiences and casting speeds using immersed boundary method

2015 ◽  
Vol 231 (8) ◽  
pp. 1363-1378 ◽  
Author(s):  
Manish Kumar ◽  
Somnath Roy ◽  
Sudhanshu Sekhar Panda
Keyword(s):  
Continuous Casting ◽  
Immersed Boundary Method ◽  
Shell Thickness ◽  
Message Passing Interface ◽  
Moving Boundary ◽  
Heat Extraction ◽  
Computational Time ◽  
Immersed Boundary ◽  
Published Data ◽  
Boundary Method

This article demonstrates implementation of immersed boundary method in continuous casting simulation involving boundary movement. In this methodology, the immersed boundary method is coupled with the second-order accurate finite difference solution of unsteady three-dimensional heat conduction equation. The moving molten metal front is modelled using the immersed boundary method in a Cartesian mesh framework that provides simplicity in its implementation and reduces the computational time as compared to the adaptive mesh solutions. A parallel programming paradigm using message passing interface has been implemented to obtain enhanced computational efficiency. This study has focused on capturing moving boundary during continuous casting and predicts the temperature distribution and shell thickness under different cooling ambiences and casting function. Good agreements with published data and correlations are obtained through numerical analysis. Mould-region shell thickness agrees well with Chipman–Fondersmith correlations. A new correlation has been further proposed for the delay constant at different heat extraction rates. The effects of key parameters like casting speed, convection and radiation from the continuous casting are also quantified in attempt to avail the data for optimal design of continuous caster.

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