用FLUENT模拟气液两相流遇到的问题

用FLUENT模拟气液两相流遇到的问题
做气液两相流的时候,选混合模型,压力入口和压力出口条件,气体选理想气体,液体是水,选择理想气体的时候就提示了：
available material properties or methods have changed.please confirm the property values before continuing.
Material air:
New property "Standard State Enthalpy" has been added.
Selecting constant method for "Standard State Enthalpy" -- data required.
New property "Reference Temperature" has been added.
Selecting constant method for "Reference Temperature" -- data required.
Warning:Only one compressible phase is allowed.
Please use the Phases panel to select an appropriate material for each
phase.
上回看了知道混合模型只能用一种可压缩流体,可是我只选个理想气体啊,想不通为什么?要怎么设置呢?