Using Numerical Dissipation Rate and Viscosity to Assess Turbulence‐Related Data Accuracy – Part 1: Experimental Setup

Abstract

This is the first part of a two‐part paper focusing on the assessment of accuracy of turbulence‐related data from computational fluid dynamics (CFD) simulations using effective numerical dissipation rate and effective numerical viscosity. Setup of the CFD cases replicating a swirling pipe flow experiment from literature, for which turbulence‐related data measured via laser Doppler anemometry (LDA) had been reported, is presented. The way effective numerical dissipation rate and effective numerical viscosity were obtained for each mesh cell is also discussed. The results of the study are presented in the second part of this series.

Using Numerical Dissipation Rate and Viscosity to Assess Turbulence‐Related Data Accuracy – Part 2: Results

“…Figs. 2-6 show the mean distributions of the diagonal components of the Reynolds stress tensor, t ii , normalized using the overall mean flow velocity, u m = 2.34 m s -1 (this corresponds to the total mass flow rate of 3.8135 kg s -1 ; see [1]).…”

“…The first paper of this two-part series [1] discussed the experimental setup involving the flow system from Fig. 1.…”

“…To keep computational times manageable, the WMLES-based cases featured a shorter pipe segment (1 m instead of 5 m, i.e., only up to L/D = 17.3). Refer to [1] for a detailed description of the meshes, CFD setup, etc.…”