Inflow condition generation method and system for complex terrain wind field numerical simulation

Abstract

The invention discloses an inflow condition generation method and system for complex terrain wind field numerical simulation. The method comprises: after sampling of a flow statistical variable contour line in a steady state, mapping the contour line to an inflow boundary surface of a complex terrain wind field in a main simulation region, and carrying out flow field simulation calculation in the main simulation region; comparing the simulated wind speed at a representative anemometer tower in the main simulated area with the actually measured average wind speed; according to a difference value obtained after comparison of the simulated wind speed and the actually measured average wind speed, feeding back a driving wind speed parameter for correcting leading simulation, and then generating a steady-state inflow boundary condition of the main simulation area; expanding to a large vortex simulation type atmosphere turbulence mode, establishing a time sequence database of the unsteady transient wind speed, and generating transient wind speed inflow boundary conditions of the main simulation area according to the time sequence database. According to the method, the influence of the existing simplified inflow boundary condition on the flow simulation precision and uncertainty of the whole wind field area is overcome, and the inflow condition generation method suitable for different atmospheric turbulence modes is established.

Description

technical field [0001] The invention belongs to the technical field of computational fluid dynamics, and in particular relates to a method and a system for generating inflow conditions for numerical simulation of complex terrain wind fields. Background technique [0002] Wind resource reserves are abundant, and most of the potential, under-construction, and active large-scale onshore wind farms are located in wind energy accumulation areas under complex terrain such as mountains, hills, and plateaus. Computational Fluid Dynamics (CFD) technology, as a fluid dynamics numerical solution model combining modern computing technology and atmospheric dynamics, has become an important tool for wind energy resource assessment in the development of wind power projects in complex terrain areas. [0003] The geometric modeling range of the wind resource simulation calculation in the area where the wind farm is located is usually based on the underlying surface of the ground and extends ...

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Problems solved by technology

[0005] In general, the above-mentioned setting method of inflow boundary conditions is more convenient in the realization of the calculation program, but when the topography of the area where the wind farm is located is relatively complex and rugged, and the bottom edge of the inflow interface is an irregular geometric boundary, the actual inflow area of ​​the wind farm The distribution of wind speed in the vertical direction is not a constant value, or it does not fully conform to the theoretical model of the atmospheric logarithmic wind profile. Using the above-mentioned inflow condition setting method has the problem of over-simplification of the actual inflow wind conditions, resulting in the inability to correctly reflect the actual situation at the inflow boundary. The statistical state of the flow will affect the accuracy of the wind speed solution in the calculation area; at the same time, when using the uniform average wind speed and wind speed standard deviation boundary condition setting method, it is difficult to measure the representative anemometer tower in the wind field area To reproduce the wind statistical data, to a certain extent, increase the uncertainty of the wind resource simulation prediction in the target area

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