Development of a multi-block high-order DNS code for turbulent flow simulations
Castagna, J. and Yao, Y. (2010) Development of a multi-block high-order DNS code for turbulent flow simulations. IOP Conference Series: Materials Science and Engineering, 10 (1). 012027. ISSN 1757-8981
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Publisher's URL: http://dx.doi.org/10.1088/1757-899X/10/1/012027
A high-order ¯nite-di®erences direct numerical simulation code is developed for studying turbulent °ows over complex geometries. The solver uses a global mapping based multi-block arrangement, with each block consisting of a structured mesh and the adjacent blocks overlapping each other along the interfaces. The physical bounds of interfaces are determined by using a pre-processing, and a pre-compiler is developed to reduce the computational costs by simplifying the expensive Jacobian calculations. The code is validated for several benchmark tests including free-stream preservation on a single-block wavy grid. For multi-block application, simulation of a square jet in a turbulent cross °ow has been performed. The °ow conditions are Reynolds number Re1 = 1000, based on the free-stream quantities and the jet exit width, and a jet to a cross °ow velocity ratio of R = 0.5, 1.5, respectively. A counter-rotating vortex pair has been captured downstream of the jet exit and it was also found that the streamwise and the spanwise mean velocity pro¯les are in reasonable good agreements with available experimental measurements. However, some discrepancies are observed in other °ow statistics such as the normal mean velocity and the kinetic energy distributions, and they are probably due to the low Reynolds number e®ect of the simulation.