Abstract:

The approach of accelerating the applications with GPUs already delivers impressive computational performance compared to the traditional CPU.The hardware architecture of GPU is a significant departure from CPUs,hence the redesign and validation of the numerical algorithm are required.The spectralfinitedifference scheme is usually used in the direction, and the  numerical simulation (DNS) of turbulent channel flows is studied.In order to validate the numerical accuracy,the scalar diffusion equation is first solved with this scheme,and the results from GPU and CPU are validated with the analytical solution.The performance study of the scalar diffusion equation shows at least 20X speedup.For the 3D full NavierStokes equation,the performance on GPU shows a 24X speedup.

Key words: heterogeneous platform;GPGPU;parallel algorithm;incompressible NavierStokes;spectralfinite difference hybrid scheme