Vorticity isosurfaces

Figure 13.7 Aspect ratio effects on the combustion of a propane-nitrogen jet with oxygen-nitrogen surroundings. Instantaneous visualizations temperature distributions superimposed on vorticity isosurfaces [34] (a) AR = 1 (6) AR = 2...

Figure 13.3 Instantaneous isosurfaces of the vorticity magnitude for the square jet [9] at two times ti (a) and (6). 1 — hairpin rib pairs, 2 — vortex rings, 3 — vortex lines, 4 — flow ejection, and 5 — vortex-ring flattening...

Figure 7.5. DNS of a premixed flame interacting with three-dimensional isotropic turbulence [261]. An isosurface of temperature is visualized. The reaction rate is presented in two planes which are normal to the mean flame front. The vorticity field, corresponding to turbulent motions, is also displayed in the bottom plane.

Isosurfaces of vorticity trailing from a rotating impeller in a sliding mesh model... 

Clearly, the helicity has a value of zero in 2D simulations. In 3D simulations, it gives an indication of how well the local rotation of a fluid element is aligned with the velocity of the element. It is useful for illustrating longitudinal vortices, or spiral motion, as is often found in vortex cores. In Figure 5-21, isosurfaces of helicity are used to depict the longitudinal vortices generated in the Kenics static mixer described in Section 5-7.10. 

Figure 5-21 Isosurfaces of helicity are used to show the longitudinal vortices in a Kenics static mixer.

Figure 1.7 Vorticity (with blue) and trace of conformation tensor (with yellow) isosurfaces, close to their maximum values, obtained in a FENE-P polymer simulation of turbulent channel flow. The flow is from back to front with the bottom and top surfaces representing the channel walls. The close-to-maximum vorticity...

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