This document discusses Mahesh Patil's thermal science research project which involves analyzing the flow over a delta wing using computational fluid dynamics (CFD). The project has two phases: a literature review phase involving five research papers on vortex breakdown and control over delta wings, and a CFD analysis phase. The research papers investigate vortex breakdown using experiments, Reynolds-averaged Navier-Stokes equations with different turbulence models, and particle image velocimetry (PIV) to analyze flow structures. The CFD analysis will evaluate the thermal performance of an automobile radiator with a delta wing configuration.

1. Mahesh Patil
M130379ME
Thermal Science

2. Phase I
Introduction
Research papers
Phase II
CFD analysis

3. Research Paper 1
 Progress in Aerospace Sciences 37 (2001) 385–
418
 Anthony M. Mitchell, Jean Delery
 Vortex breakdown detrimental or beneficial
effects, depending on the application.
 Diverse control methods developed
 Still a superior efficiency or effectiveness in
controlling either the vertical flow structure or the
vortex breakdown location? – not fully
understood

4.  In a water tunnel over a slender delta wing as
a result of the emission of colored dye near
the apex
 The control and exact location vortex
breakdown- requires basic understanding and
physics of the phenomenon
 Techniques- mechanical, pneumatic
 Major obstacles in vortex breakdown
implementation in new generation aircrafts
like delta winged.

5. Research Paper 2
 The numerical simulation of the flow around a
65◦ delta wing configuration with rounded
leading edges is presented
 Numerical solutions: RANS ( Reynolds-Averaged
Navier-Stoke eqs.) using different turbulent
models
 How flow topology depends on angle of attack
and Reynolds no.

6. Wilcox k-w model (k-w)
Spalart Allmaras model (SA)
CFD simulations around a 65◦ delta wing
with rounded leading edges and angle of
attack α = 13.3◦ carried out
inner vortex is generated out of a vorticity
layer moving downstream
inner vortex occurs before the outer vortex
is generated

8. Research Paper 3
Azize Akcayoglu (2011)
Experimental study of flow structure in
horizontal equilateral triangular ducts
having double rows of half delta-wing
type vortex generators mounted on the
duct’s slant surfaces
Flow field measurements using PIV
(particle image velocimetry)

9. CFU & CFD ( common flow up & common
flow down )
Contradictory results in earlier litterature
So verified through experiment

10. Reynolds no. varied from 1000 to 8000
Duct 1 : pair of CFU (common flow up)
Duct 2: CFU + CFD
Motivation: which duct gives larger vortex
formation
Result: duct 2 gives larger vortex formation
& greater induced vorticity

11. Research Paper 4
 A. Joardar, A.M. Jacobi (2005)
 Experimentally verified the effectiveness of delta
wing type vortex generators using full scale wind
tunnel
 Compact heat exchanger is used (eg.
Automobile radiator)

12. Average heat transfer enhancement by
21%
Pressure drop penalty of 6%

13. Reseach Paper 5
Russell M. Cummings, Andreas Schütte
(2013)
 International VFE (vortex flow experiment)
Numerical solution within for VFE-2 delta
wing
with rounded leading edge
 Simulation software: Cobalt Navier-Stoke
solver
SA, SARC, DES, DDES

14.  CFD calculation with the unstructured Cobalt
code are presented
 Used various turbulent models and compared
with experimental data available (surface
pressure, PIV)
 RANS simulation results close to experimental
results than DES, DDES.

15. CFD analysis of flow over delta wing to
evaluate the thermal performance of
automboile radiator