计算流体力学领域一个经典的算例，方腔流动，验证格子波尔兹曼方法的一个简单小程序。-A classical benchmark in CFD field cavity flow

波形采集。用MFC采集正弦波和方波，周期和采样率可变。-Waveform acquisition. MFC collection with sine and square waves, cycles and variable sampling rate.