结合视频，尝试回答：
1、常用的热/流体分析边界条件有哪些？
【工况一】内部和外部自然对流
入口：压力为0，温度T；
出口：压力为0。
【工况二】机箱类分析
压力或速度边界条件：
1、Known inlet flow
入口: Velocity or Volume Flow Rate or External Fan.
出口:Static Gage Pressure = 0
2、Known outlet flow
入口: Static Gage Pressure = 0.
出口: Velocity or Volume Flow Rate or External Fan
3、Known Pressure Drop
入口: Static Gage Pressure> 0.
出口: Static Gage Pressure = 0.
4、Known Internal Fan
入口: Static Gage Pressure = 0.
出口: Static Gage Pressure = 0.
Internal Fan material in the device.
热边界条件：
1、Apply a Temperature boundary condition to all openings in which air enters the device. Do not apply a temperature to outlets.
2、Apply a Total Heat Generation boundary condition on components that dissipate heat. Note that power is evenly dissipated over the entire volume.
3、To simulate heat transfer to the surroundings, apply a Film Coefficient boundary condition to the external surfaces. The value depends on the air that surrounds the physical device:
1）If the air is still, use a value of 5 W/m²K.
2）If the air is moving, use a value of 20 W/m²K.
3）Use a Reference Temperature = ambient temperature.【工况三】阀芯的运动
入口：温度，速度
出口：压力为0【工况四】超音速
入口：速度，压力为0；
出口：未知；
尽量使空气域为特征尺寸的20倍以上。更多内容请关注微信公众号
“CAESaveTheWorld”
