Parallel computing method for distributed hydrodynamic model of large-scale watershed system

Abstract

The invention discloses a parallel computing method for a distributed hydrodynamic model of a large-scale watershed system. The parallel computing method includes performing a parallel algorithm to a distributed numerical model of the large-scale watershed, with regular nets as basic computing elements and partitioned zones as compute nodes. The problem of limited 2G memory array of a win32 program in a large-scale watershed simulation is solved by diving the watershed zone and performing a distributed cluster computing, and the large-scale watershed simulation is fine; based on a distributed message passing model, data are exchanged by establishing adjacent partitioned overlap zones, thus error correction of boundary data of the partitioned node is achieved, and consistency and accuracy of the whole watershed simulation are realized; according to a parallel general protocol integrating OPENMP and MPI (message passing interface), computing parallelization of and in the partitioned nodes is achieved, and efficient fine simulation of the large-scale water shed is realized. By the use of the parallel computing method, the numerical simulation of the hydrodynamic force of the large-scale watershed system is available with low cost and high efficiency and speed.

Description

technical field [0001] The invention belongs to the field of fluid mechanics, and relates to a calculation method of a distributed hydrodynamic model of a watershed, in particular to a parallel calculation method of a large-scale water system distributed hydrodynamic model of a watershed based on regional blocks, and its algorithm principle is suitable for application Numerical simulation of water flow in large-scale watersheds and large-scale hydrodynamic calculations. Background technique [0002] The distributed hydrodynamic model is a numerical method for flow field simulation based on computational fluid dynamics. The calculation of this method is based on the discretization of the simulated object, using the finite difference method, finite volume method or finite element method, etc. Numerical simulation is carried out to simulate the fluid flow law of the realization process. In the grid discretization of hydrodynamic simulation, common discretized grids include str...

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Problems solved by technology

[0005] Aiming at the problem that the existing hydrodynamic model is limited by the 2G memory of the array variable of the win32 system and the computing power of ordinary computers, the hydrodynamic model cannot simulate the hydrodynamic state of the large-scale water system with a fine grid. The parallel calculation method of the large-scale water system distributed hydrodynamic model of the block watershed, through the distributed processing of large-scale fine grids, introduces MPI and Openmp for nesting and parallelization between distributed nodes and within nodes to realize the hydrodynamic analysis of large-scale water systems fine simulation of

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