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18
A fast variational framework for accurate solidfluid coupling
 ACM Trans. Graph
, 2007
"... Figure 1: Left: A solid stirring smoke runs at interactive rates, two orders of magnitude faster than previously. Middle: Fully coupled rigid bodies of widely varying density, with flow visualized by marker particles. Right: Interactive manipulation of immersed rigid bodies. Physical simulation has ..."
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Cited by 75 (4 self)
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Figure 1: Left: A solid stirring smoke runs at interactive rates, two orders of magnitude faster than previously. Middle: Fully coupled rigid bodies of widely varying density, with flow visualized by marker particles. Right: Interactive manipulation of immersed rigid bodies. Physical simulation has emerged as a compelling animation technique, yet current approaches to coupling simulations of fluids and solids with irregular boundary geometry are inefficient or cannot handle some relevant scenarios robustly. We propose a new variational approach which allows robust and accurate solution on relatively coarse Cartesian grids, allowing possibly orders of magnitude faster simulation. By rephrasing the classical pressure projection step as a kinetic energy minimization, broadly similar to modern approaches to rigid body contact, we permit a robust coupling between fluid and arbitrary solid simulations that always gives a wellposed symmetric positive semidefinite linear system. We provide several examples of efficient fluidsolid interaction and rigid body coupling with subgrid cell flow. In addition, we extend the framework with a new boundary condition for freesurface flow, allowing fluid to separate naturally from solids.
Numerical Modelling of Heat and Mass Transfer and Optimisation of a Natural Draft Wet Cooling Tower
, 2008
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Large eddy simulation of fuel variability and flame dynamics of hydrogenenriched nonpremixed flames", Fuel Process. Technol. 107
, 2013
"... Large eddy simulation of fuel variability and flame dynamics of hydrogenenriched nonpremixed flames This item was submitted to Loughborough University's Institutional Repository by the/an author. ..."
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Cited by 1 (0 self)
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Large eddy simulation of fuel variability and flame dynamics of hydrogenenriched nonpremixed flames This item was submitted to Loughborough University's Institutional Repository by the/an author.
DEVELOPMENT OF AN EFFICIENT VISCOUS APPROACH IN A CARTESIAN GRID FRAMEWORK AND APPLICATION TO ROTORFUSELAGE INTERACTION Approved by:
, 2006
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LES OF RECIRCULATION AND VORTEX BREAKDOWN IN SWIRLING FLAMES
, 2007
"... vortex breakdown in swirling flames This item was submitted to Loughborough University's Institutional Repository by the/an author. ..."
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vortex breakdown in swirling flames This item was submitted to Loughborough University's Institutional Repository by the/an author.
Journal of Computational Physics 211 (2006) 531–550
, 2005
"... www.elsevier.com/locate/jcp A Cartesian grid embedded boundary method for the heat equation and PoissonÕs equation in three dimensions ..."
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www.elsevier.com/locate/jcp A Cartesian grid embedded boundary method for the heat equation and PoissonÕs equation in three dimensions
Author manuscript, published in "ACM Transactions on Graphics (Proceedings of SIGGRAPH 2007) (2007)" A Fast Variational Framework for Accurate SolidFluid Coupling
"... Figure 1: Left: A solid stirring smoke runs at interactive rates, two orders of magnitude faster than previously. Middle: Fully coupled rigid bodies of widely varying density, with flow visualized by marker particles. Right: Interactive manipulation of immersed rigid bodies. ..."
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Figure 1: Left: A solid stirring smoke runs at interactive rates, two orders of magnitude faster than previously. Middle: Fully coupled rigid bodies of widely varying density, with flow visualized by marker particles. Right: Interactive manipulation of immersed rigid bodies.
Computational simulation of the interactions between moving rigid bodies and incompressible twofluid flows
"... We present a twodimensional computational flow solver for simulation of twoway interactions between moving rigid bodies and twofluid flows. The fluids are assumed to be incompressible and immiscible. The twostep projection method along with Graphics Processing Unit (GPU) acceleration is employ ..."
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We present a twodimensional computational flow solver for simulation of twoway interactions between moving rigid bodies and twofluid flows. The fluids are assumed to be incompressible and immiscible. The twostep projection method along with Graphics Processing Unit (GPU) acceleration is employed to solve the flow equations. The fluidsolid interaction is captured by using the fictitious domain method. A consistent mass and momentum scheme is implemented, which allows for simulation of multiphase flows characterized by large density ratios. The evolution of interfaces in the threephase system is tracked by using the volumeoffluid method with two scalar functions, representing the solid domain and one of the fluids. A geometrical approach is employed to reconstruct the interfaces in cells containing three phases and capture the intersection of phase interfaces (triple point). The performance and accuracy of the flow solver are assessed through a set of canonical test cases. Then, it is used to simulate the interactions between a freefloating buoy and waves generated by a bottomhinged paddle in a wave tank.
A Second Order Thermal and Momentum Immersed Boundary Method for Conjugate Heat Transfer in a Cartesian Finite Volume Solver
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Linkwise Artificial Compressibility Method
"... The Artificial Compressibility Method (ACM) for the incompressible NavierStokes equations is (linkwise) reformulated (referred to as LWACM) by a finite set of discrete directions (links) on a regular Cartesian mesh, in analogy with the Lattice Boltzmann Method (LBM). The main advantage is the pos ..."
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The Artificial Compressibility Method (ACM) for the incompressible NavierStokes equations is (linkwise) reformulated (referred to as LWACM) by a finite set of discrete directions (links) on a regular Cartesian mesh, in analogy with the Lattice Boltzmann Method (LBM). The main advantage is the possibility of exploiting well established technologies originally developed for LBM and classical computational fluid dynamics, with special emphasis on finite differences (at least in the present paper), at the cost of minor changes. For instance, wall boundaries not aligned with the background Cartesian mesh can be taken into account by tracing the intersections of each link with the wall (analogously to LBM technology). LWACM requires no highorder moments beyond hydrodynamics (often referred to as ghost moments) and no kinetic expansion. Like finite difference schemes, only standard Taylor expansion is needed for analyzing consistency. Preliminary efforts towards optimal implementations have shown that LWACM is capable of similar computational speed as optimized (BGK) LBM. In addition, the memory demand is significantly smaller than (BGK) LBM. Importantly, with an efficient implementation, this algorithm may be one of the few which is computebound and not memorybound. Two and threedimensional benchmarks are investigated, and an extensive comparative study between the present approach and state of the art methods from the literature is carried out. Numerical evidences suggest that LWACM represents an excellent alternative in terms of simplicity, stability and accuracy. Key words: artificial compressibility method (ACM); lattice Boltzmann method (LBM); complex boundaries; incompressible NavierStokes equations