关于fluent气体压力的问题

ygh1984

请教各位一个问题。 我图中红色表示流体，黄色为大气，下面的凸凹表示壁面。 分析是使流体靠自身重力填进凹槽中。  现在我想模拟的是， 在流体表面向下吹气压，看这个气压利于填充的影响程度。 请问改如何加这个气压。 我的pressure inlet是黄色边框最上边的线。 谢谢

     请问一下，这个分析是不是operating condition中的气压不用变？ pressure inlet中几个参数又该如何设置那？ guage pressure 和 supersonic pressure 之间又有什么联系那？ 谢谢各位了？

葡萄的苹果

首先要注意语言的准确性，什么叫"向下吹气压"，气压是可以吹的吗？这是Fluent帮助文档中的解释：
Remember that the total pressure value is the gauge pressure with respect to the operating pressure defined in the Operating Conditions panel.

The static pressure (termed the Supersonic/Initial Gauge Pressure) must be specified if the inlet flow is supersonic or if you plan to initialize the solution based on the pressure inlet boundary conditions. Solution initialization is discussed in Section  24.13.

Remember that the static pressure value you enter is relative to the operating pressure set in the Operating Conditions pa
The Supersonic/Initial Gauge Pressure is ignored by FLUENT whenever the flow is subsonic, in which case it is calculated from the specified stagnation quantities. If you choose to initialize the solution based on the pressure-inlet conditions, the Supersonic/Initial Gauge Pressure will be used in conjunction with the specified stagnation pressure to compute initial values according to the isentropic relations (for compressible flow) or Bernoulli's equation (for incompressible flow). Therefore, for a sub-sonic inlet it should generally be set based on a reasonable estimate of the inlet Mach number (for compressible flow) or inlet velocity (for incompressible flow).

也就是Supersonic/Initial Gauge Pressure 一般用在超音速情况下，或者你想用这个压力作为流场的初始条件。
这两个压力都是相对operating pressure来说的，总压分别是这两个值加上你在Operating Condition里面设的Operating Pressure.