Everything about Incompressible Flow totally explained
In
fluid mechanics or more generally
continuum mechanics, an
incompressible flow is
solid or
fluid flow in which the
divergence of velocity is zero. This is more precisely termed
isochoric flow. It is an idealization used to simplify analysis. In reality, all materials are compressible to some extent. Note that isochoric refers to flow, not the material property. This means that under certain circumstances,
a compressible material can undergo (nearly) incompressible flow. However, by making the 'incompressible' assumption, the governing equations of material flow can be simplified significantly.
The equation describing an incompressible (isochoric) flow,
» ) can be assumed to be constant. The subtlety above is frequently a source of confusion. Therefore many people prefer to refer explicitly to
incompressible materials or
isochoric flow when being descriptive about the mechanics.
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