An urban multi-scale wind environment numerical simulation method

Abstract

The invention provides an urban multi-scale wind environment numerical simulation method, which comprises the following steps of: generating a circular urban terrain model taking a city as a center, embedding an urban building group model into the urban terrain model through model inlaying, and establishing a wide-area urban overall model; extracting a wide-area city overall model by adopting Boolean subtraction operation, segmenting the wide-area city model in a form of a round outside and a square inside, and performing simulation; extracting an embedded local block model, performing interpolation on the boundary, and providing an accurate wind environment boundary condition for the local block model and performing simulation. According to the method, a nested model method is adopted, unreasonable inflow boundary assumption can be avoided in large-scale urban overall simulation, and a reasonable flow velocity boundary is provided for a local block model directly after urban macroscopic wind field simulation; meanwhile, the urban overall model adopts a circular boundary form, and the same set of grids can be adopted for different wind speed directions, so that the workload of modeling and grid multi-time division is greatly reduced.

Description

technical field [0001] The present disclosure relates to the field of urban wind environment analysis, in particular to a numerical simulation method for urban multi-scale wind environment. Background technique [0002] At present, my country is in the accelerated stage of urbanization development. Due to the large population, scarce land, and relatively scarce resources per capita, urban development has to adopt a high-intensity development model. Under the influence of this development model, the urban heat island effect continues to strengthen, the air pollution is serious, and the haze weather occurs frequently. The serious deterioration of air quality is not only caused by air pollution sources emitted by factories, but also due to wind environment problems such as static wind and eddy currents caused by urban layout. Air quality in local areas. Therefore, controlling urban airflow, improving urban ventilation efficiency, and optimizing the microclimate environment ha...

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Problems solved by technology

[0005] Based on the above prior art, there are still the following problems: First, the simulation of the local environment and the input boundary conditions do not correspond to the actual wind field environment

Since the local environment of the block is under the influence of the surrounding building environment, if the original wind field value of the meteorological station is directly used to set the boundary conditions, the boundary conditions will not conform to the actual wind field, and then the simulation results will not be accurate enough.

Second, if the simulation is carried out using the method of enclaving the entire urban grid, it will lead to a huge amount of calculation, and it is difficult for general-purpose computers and even workstations to meet the huge amount of calculation requirements

Third, under the condition of studying multiple wind directions, the simulated model must be constructed repeatedly, which greatly increases the modeling workload, which limits the multi-scheme digital-analog optimization research on many practical problems

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