The theoretical foundation of the user and the selection of some factors determine the calculation accuracy in the simulation of the architectural numerical wind tunnel.
数值风洞模拟要想获得理想的计算精度，依赖计算人员的理论基础及其在具体操作中对各种重要因素的选择。
Numerical simulation of pollutants' diffusion in air has been adopted widely, but the false diffusion occurring in simulation is always an important factor affecting the accuracy of the results.
用数值模拟的方法预测污染物在大气中的扩散已经被广泛采用，但数值模拟产生的伪扩散一直是影响模拟结果精度的重要因素。
Simulation results indicate that DD1, DD2 filters have stronger tracking performance and larger application scope, and achieve higher numerical stability and accuracy than EKF.
仿真结果表明，DD1和DD 2滤波具有较强的跟踪性和较宽的应用范围，数值稳健性和精度优于EKF算法。
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