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  2. Kelvin–Helmholtz instability - Wikipedia

    en.wikipedia.org/wiki/KelvinHelmholtz_instability

    Numerically, the KelvinHelmholtz instability is simulated in a temporal or a spatial approach. In the temporal approach, the flow is considered in a periodic (cyclic) box "moving" at mean speed (absolute instability). In the spatial approach, simulations mimic a lab experiment with natural inlet and outlet conditions (convective instability ...

  3. Hydrodynamic stability - Wikipedia

    en.wikipedia.org/wiki/Hydrodynamic_stability

    The KelvinHelmholtz instability (KHI) is an application of hydrodynamic stability that can be seen in nature. It occurs when there are two fluids flowing at different velocities. The difference in velocity of the fluids causes a shear velocity at the interface of the two layers. [3] The shear velocity of one fluid moving induces a shear ...

  4. Mixed layer - Wikipedia

    en.wikipedia.org/wiki/Mixed_layer

    This process is often described and modelled as an example of Kelvin-Helmholtz instability, though other processes may play a role as well. Finally, if cooling, addition of brine from freezing sea ice, or evaporation at the surface causes the surface density to increase, convection will occur.

  5. What are Kelvin-Helmholtz clouds? Rare formation spotted over ...

    www.aol.com/news/kelvin-helmholtz-clouds-rare...

    A Kelvin-Helmholtz instability forms where there's a velocity difference across the interface between two fluids: for example, wind blowing over water.You’ll often see the characteristic wave ...

  6. Stable and unstable stratification - Wikipedia

    en.wikipedia.org/wiki/Stable_and_unstable...

    Depending on the size of the velocity difference and the size of the density contrast between the layers, Kelvin-Helmholtz waves can look different. For instance, between two layers of air or two layers of water, the density difference is much smaller and the layers are miscible; see black-and-white model video.

  7. Taylor–Goldstein equation - Wikipedia

    en.wikipedia.org/wiki/Taylor–Goldstein_equation

    It describes the dynamics of the KelvinHelmholtz instability, subject to buoyancy forces (e.g. gravity), for stably stratified fluids in the dissipation-less limit. Or, more generally, the dynamics of internal waves in the presence of a (continuous) density stratification and shear flow.

  8. Vortex sheet - Wikipedia

    en.wikipedia.org/wiki/Vortex_sheet

    In particular, they may exhibit KelvinHelmholtz instability. The formulation of the vortex sheet equation of motion is given in terms of a complex coordinate z = x + i y {\displaystyle z=x+iy} . The sheet is described parametrically by z ( s , t ) {\displaystyle z(s,t)} where s {\displaystyle s} is the arclength between coordinate z ...

  9. Lee wave - Wikipedia

    en.wikipedia.org/wiki/Lee_wave

    KelvinHelmholtz instability can occur when velocity shear is present within a continuous fluid or when there is sufficient velocity difference across the interface between two fluids. Rossby waves (or planetary waves) are large-scale motions in the atmosphere whose restoring force is the variation in Coriolis effect with latitude.