xsp2020 发表于 2021-8-26 21:06:43

DPM模型中计算单元内总滞留时间问题

软件:FLUENT 19.2描述:采用DPM模型,在非耦合状态下获得颗粒物浓度分布,打算采用UDF的方法处理。
问题:浓度计算公式如下,其中需要的一个参数滞留时间可通过“dt = (P_TIME(tp)-P_TIME0(tp))”获得,计算公式转化为“C_UDMI(c,t,0)=P_FLOW_RATE(tp)*dt/C_VOLUME(c,t)”。通过运行发现,其滞留时间只考虑了单个颗粒(parcel)的值而非单元内所有经过的颗粒,如共有5个颗粒,其中3个经过而2个不经过(时间步内)。所以想请教下该如何为每个单元(cell)计算其内总滞留时间,UDF中该如何添加命令呢?
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希望有大神能帮帮忙解答下这些问题,谢谢了。

xsp2020 发表于 2021-8-26 21:07:37

C:\Users\xsp\Downloads\计算公式.png

DPM模型@ 发表于 2021-12-2 13:27:49

您好,我在用DPM模型单向耦合计算泥沙颗粒通过率时,,随着进水口压力的增加,从出口逃逸出来的粒子变少,请问是哪方面的原因?
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