University:
Boston University
Course:
ENG ME 302 | Engineering Mechanics II
Academic year:

2019
Views:

106

Pages:

11
Author:

Clint W.

Analysis of LBM/VLES Data Related to the Source Diagnostic Test Cases Tasks: in support of improving low-order modeling 1. 2. 3. 4. 5. 6. Determination of turbulence isotropy Determination of length scales Turbulence spectrum Analysis of flow field for other rotor speeds Analysis of streamwise evolution of flow Analysis of unsteady vane surface pressure Today Reminder – what is the big picture on this project Discussion of some outcomes from the LBM data analysis Original tasks not options Discuss application of low-order method to ACAT benchmark Discuss results from new wake-evolution prediction project Big picture : low-order computation of fan-FEGV broadband interaction noise Low-order method grew out of work by Nallasamy/Envia (based on Ventres) Models FEGV as 2D flat plate cascades using strip theory – response : Ventres Models duct acoustics using Green’s method (annular duct modeled) Need input data upstream of the FEGV History on this project 1. Data that are available – SDT a. Hotwire: two locations, low noise configuration, low speed 3 components of velocity (like the turbulence values) b. LDV: two locations, low noise configuration, low speed 2 components of velocity (like the mean values) History on this project Started with RANS & URANS computations to provide input data Original attempts Focused on approach rotor speed (most experimental data : HW and LDV) Obtained volume file for portion of flow field. PowerFLOW runs being improved, methods for dealing with saved data being improved Many iterations Have settled on good “extraction” methods etc. Current data from PowerFLOW Changed volume in hopes of including some further processing Approach and Takeoff (Sideline) cases now Data analysis still written and run outside of PowerFLOW tools

Analysis of LBM (VLES) Data Chapter 1