Assessment of Reynolds stress components and turbulent pressure loss using 4D flow MRI with extended motion encoding.

ABSTRACT:

Purpose

To measure the Reynolds stress tensor using 4D flow MRI, and to evaluate its contribution to computed pressure maps.

Methods

A method to assess both velocity and Reynolds stress using 4D flow MRI is presented and evaluated. The Reynolds stress is compared by cross-sectional integrals of the Reynolds stress invariants. Pressure maps are computed using the pressure Poisson equation-both including and neglecting the Reynolds stress.

Result

Good agreement is seen for Reynolds stress between computational fluid dynamics, simulated MRI, and MRI experiment. The Reynolds stress can significantly influence the computed pressure loss for simulated (eg, -0.52% vs -15.34% error; P < 0.001) and experimental (eg, 306 ± 11 vs 203 ± 6 Pa; P < 0.001) data. A 54% greater pressu

SUBMITTER: Haraldsson H 

PROVIDER: S-EPMC5927556 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature