waveTransmissive边界条件
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这个无反射边界条件具体怎么用呢？看了OpenFOAMwiki也是一头雾水。有两个疑问：
这个Ilnf和fieldIlnf的值怎么选呢？
这个条件如果用到出口有反压的情况，是否可以？
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@Aeronastro
看过这个描述么？Description This boundary condition provides an advective outflow condition, based on solving DDt(psi, U) = 0 at the boundary. The standard (Euler, backward, CrankNicolson) time schemes are supported. Additionally an optional mechanism to relax the value at the boundary to a specified far-field value is provided which is switched on by specifying the relaxation length-scale \c lInf and the far-field value \c fieldInf. The flow/wave speed at the outlet is provided by the virtual function advectionSpeed() the default implementation of which requires the name of the flux field \c (phi) and optionally the density \c (rho) if the mass-flux rather than the volumetric-flux is given. The flow/wave speed at the outlet can be changed by deriving a specialised BC from this class and over-riding advectionSpeed() e.g. in waveTransmissiveFvPatchField the advectionSpeed() calculates and returns the flow-speed plus the acoustic wave speed creating an acoustic wave transmissive boundary condition. \heading Patch usage \table Property | Description | Required | Default value phi | flux field name | no | phi rho | density field name | no | rho fieldInf | value of field beyond patch | no | lInf | distance beyond patch for \c fieldInf | no | \endtable Example of the boundary condition specification: \verbatim myPatch { type advective; phi phi; } \endverbatim Note If \c lInf is specified, \c fieldInf will be required; \c rho is only required in the case of a mass-based flux. SourceFiles advectiveFvPatchField.C
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@cfd-china 看过了，不过还是不太明白是否能解决我提出的问题:confused:
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Henry最近添加了部分描述：点击查看
