Pulsatile Flow through an Eccentric Stenosis

Stenosis severity: 75  %

Stenosis length: L = 2D

Inlet boundary condition: Womersley profile (for pulsatile flow through a rigid circular tube)  

Waveform: Sinusoidal (with an amplitude of 67%)

Re (mean) = 600 [ Peak Re = 1000 , Minimum Re = 200 ] (based on centerline average velocity)

Womersley number = 7.5

See Statistics

See Hemodynamic Indicators (WSS, WSS gradients)


Coherent structures identified using the lambda - 2 criterion of Jeong & Hussain (with colors reflecting the instantaneous 3-D pressure distribution). Wall shear stress contours are also shown in the inset.




See close up snapshots and details of coherent structures and wall shear stress magnitudes in the immediate downstream region of the stenosis

See close up snapshots and details of coherent structures and wall shear stress magnitudes in the transitional/ turbulent region

 
Vorticity magnitude contours (in two planes)




Coherent structures and vorticity magnitude contours (in two planes)  

Coherent structures and wall shear stress  without the wall pressure distribution

Coherent structures without WSS and pressure distribution


References


The following plot shows the temporal and spatial variation of axial velocity, w (along the centerline) . The axial location z = 0 corresponds to the stenosis throat.

 



Outflow boundary condition fix in the stenotic vessel (click here for more details)

Velocity vectors near the outflow of the stentic vessel at a single instant during the cycle which show (from left to right) a corrected case, an uncorrected case and the difference between the two.

   


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