Computer Methods in Applied Mechanics and Engineering

A critical review of the pseudopotential multiphase lattice Boltzmann model: Methods and applications

T F Torrence (ed) 1982 Edinburgh: Scottish Academic Press xiii + 103 pp price £7.50 In 1865 James Clerk Maxwell published in the Philosophical Transactions a long paper entitled 'A dynamical theory of the electromagnetic field'. In this work, about which he wrote to a relative, 'I have a paper afloat, with an electromagnetic theory of light, which, till I am convinced of the contrary, Ihold to be great guns', he set up the electromagnetic field equations unifying electricity and magnetism, and identified light as 'an electromagnetic disturbance in the form of waves propagated through the electromagnetic field according to electromagnetic laws'.

A Dynamical Theory of the Electromagnetic Field

Cavitation and Bubble Dynamics: Preface

Approximate Riemann Solvers

GPU is continuing its trend of vastly outperforming CPU while becoming more general purpose. In order to improve the efficiency of AES algorithm, this paper proposed a CUDA implementation of Electronic Codebook (ECB) mode encoding process and Cipher Feedback (CBC) mode decoding process on GPU. In our implementation, the frequently accessed T-boxes were allocated on on-chip shared memory and the granularity that one thread handles a 16 Bytes AES block was adopted. Finally, we achieved the highest performance of around 60 Gbps throughput on NVIDIA Tesla C2050 GPU, which runs up to 50 times faster than a sequential implementation based on Intel Core i7-920 2.66GHz CPU. In addition, we discussed the optimization under some practical application scenarios such as overlapping GPU processing and data transfer.

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Implementation and Analysis of AES Encryption on GPU

Implicit unified gas-kinetic scheme for steady state solutions in all flow regimes

Unified gas-kinetic scheme for diatomic molecular simulations in all flow regimes

Natural cavitation is defined as the formation of vapor bubbles in a flow due to the pressure falling below the liquid's vapor pressure. The inception of the cavitation bubble is influenced by a lot of aspects, such as impurities, turbulence, liquid thermal properties, etc. In this paper, the exact difference method (EDM) and the Carnahan-Starling real-gas equation of state (EOS) are coupled in the Shan-Chen multiphase lattice Boltzmann model, which is validated as being suitable for simulating high liquid/vapor density ratio multiphase flows. The 2D cavitation ''bubble'' growth is simulated under a quiescent and shear flow in the inception stage. Besides yielding the large density ratio, the real-gas EOS also leads to apparently different compressibilities for liquid and vapor. The results agree with Rayleigh-Plesset predictions much better than those of a previous publication [X. Chen, Simulation of 2D cavitation bubble growth under shear flow by lattice Boltzmann model, Communications in Computational Physics 7 (2010) 212-223]. In the meantime, a comparison is conducted for single-bubble behavior under different shear rates, with reduced temperature T/T"c"r"i"t"i"c"a"l=0.6891 and relaxation time @t=1.0. The simulation results show that the cavitation bubble deformation is consistent with the bubble dynamics, D@KCa, where D and Ca are the bubble deformation and the capillary number respectively. The shear rate hardly influences the bubble growth rate.

Chengwen Zhong

Papers

Implementation and Analysis of AES Encryption on GPU

Implicit unified gas-kinetic scheme for steady state solutions in all flow regimes

Unified gas-kinetic scheme for diatomic molecular simulations in all flow regimes

Lattice Boltzmann simulation of cavitating bubble growth with large density ratio

LES-based filter-matrix lattice Boltzmann model for simulating turbulent natural convection in a square cavity