1. Institute of High Performance Computing, Singapore 138632, e-mail: wongwhm@ihpc.a-star.edu.sg
2. Institute of High Performance Computing, Singapore 138632, e-mail: guotf@ihpc.a-star.edu.sg
3. Department of Mechanical Engineering, National Univ. of Singapore, Singapore Singapore 117576, e-mail: mpecl@nus.edu.sg