低马赫数假设的流动属于可压缩流还是不可压缩流
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大家好，
我一直对于low-mach-assumption flows 感到困惑。
论文里面写到：
using the low-Mach-number assumption, where the acoustic interactions and compressibility effects are eliminated.
那么被消除的这些东西，会造成哪些影响呢？compressibility effects是否与psi有关呢？有关的话，代码里面是否就不能使用psi？
从论文给的方程来看，应该是属于可压缩流：
但我不太确定这种流动的真实属性，或者可以把这样的流动称作variable-density flow.
附上Wikipadia的一段解释：
low Mach-number flow / Pseudo-incompressibility:
The low Mach-number constraint can be derived from the compressible Euler equations using scale analysis of non-dimensional quantities.
The restraint, like the previous in this section, allows for the removal of acoustic waves, but also allows for large perturbations in density and/or temperature.
The assumption is that the flow remains within a Mach number limit (normally less than 0.3) for any solution using such a constraint to be valid.
Again, in accordance with all incompressible flows the pressure deviation must be small in comparison to the pressure base state.希望大家能帮忙解答一下，谢谢！
