Sirod Sirisup

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Low-dimensional flow dynamical systems may converge to erroneous states after long-time integration, even if they are initialized with the correct state. In this paper, we investigate the accuracy of such two-dimensional models constructed from Karhunen–Loeve expansions for flows past a circular cylinder. We first demonstrate that although the short-term(More)
The global arrays toolkit is a library that allows programmers to write parallel programs that use large arrays distributed across processing nodes through the aggregate remote memory copy interface (ARMCI). In this study, we have further our investigation on the performance of a parallel application implemented with the global arrays toolkit on homogeneous(More)
The global arrays toolkit is a library that allows programmers to write parallel programs that use large arrays distributed across processing nodes. The toolkit provides advantage of one-sided communication operations through the aggregate remote memory copy interface (ARMCI). In this study, we investigate the performance of a parallel application(More)
The Global Arrays toolkit is a library that allows programmers to write parallel programs that use large arrays distributed across processing nodes through the Aggregate Remote Memory Copy Interface (ARMCI). OpenMP is an application programming interface that supports shared memory multiprocessing on many architectures and platforms. In the Symmetric-Multi(More)
The incorrect shape and location of initial contour in the level set image segmentation method could lead to unreliable results but the proper initial contour is hard to design in some images. This paper proposes a method that is more independent using four vector flows instead of using edge detector to insert new contour. The geodesic active contour (GAC)(More)
We investigate a variational data assimilation technique for retrieval of surface currents in shallow seas. We use a physically based image model consisting of shallow-water equations, which include the effects and source terms obtained from the bathymetry. These terms are included because they can be important with respect to the characteristics of(More)
Incompressible flow around a pair of circular cylinders in various staggered arrangements with heated upstream cylinder is investigated in this study. Three dimensional direct numerical simulation (DNS) has been performed with spatial discretization based on the spectral/hp element method with the Reynolds numbers of 200 and the Richardson numbers are(More)
This paper investigates a new approach for efficiently calculating nozzle thrust based on a reduced order model formed by the proper orthogonal decomposition (POD) technique. The investigation has been done on the nozzle of MK66 rocket motor as a prototype problem. Here, the focus is on the thrust response in or near the design condition. It was found that(More)