perfectFuild里面气体体积常数R的疑惑
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各位前辈好!
自己目前研究了一下各种状态方程,对于perfectFluid里面的rho_0和R需要用户在thermophysicalProperties.water子字典里面设置的,参考openfoam自带的case里面的设置,发现R的取值为7255或者3000 J/(kg.K),
case1:
tutorials\multiphase\compressibleMultiphaseInterFoam\laminar\damBreak4phase\constant
thermoType { type heRhoThermo; mixture pureMixture; transport const; thermo hConst; equationOfState perfectFluid; specie specie; energy sensibleInternalEnergy; } mixture { specie { nMoles 1; molWeight 18.0; } equationOfState { R 7255; rho0 1027; } //剩下代码忽略
case2地址:
\tutorials\multiphase\compressibleInterDyMFoam\ras\sloshingTank2D\constant
thermoType { type heRhoThermo; mixture pureMixture; transport const; thermo hConst; equationOfState perfectFluid; specie specie; energy sensibleInternalEnergy; } mixture { specie { nMoles 1; molWeight 18.0; } equationOfState { R 3000; rho0 1027; }
我现在不太明白,perfectFluid里面的R的设置参考什么呢?3000和7255是怎么来的呢??虽然对于液体来说,可能R差了1个量级对液体密度的影响并不是很大吧