FASTest LAB

FASTest Lab. Fluid mechanics, Aerodynamics, Structure Test LABoratory

Director: Murat Dinc

Welcome and thank you for your interest in the Fluid mechanics, Aerodynamics, Sstructure Test LABoratory (FASTest LAB) at the Department of Engineering Technology, Miami University Regionals, Ohio.

I am posting here some guidelines and comments that should help you learn more about the lab and the opportunities that may be available to you.

Major Activities of this lab are:

  • Support undergraduate student research
  • Cooperate with the faculty including ENT and other departments at Miami University (e.g., Department of MME at Miami University), and other universities for research studies
  • Cooperate with the industry for research projects (automotive, aerospace, other engineering).
  • Design and include lab components for ENT-310 Fluid Mechanics and other major courses
  • Design and include projects for Senior Design student groups as part of ENT 497-498 courses
  • Develop new courses in Fluid Mechanics, Aerodynamics and CFD areas

Why study in the Fluid mechanics, Aerodynamics, Structure Test LABoratory (FASTest LAB)?

The strengths of the undergraduate programs at the Department of Engineering Technology and in FASTest LAB include having access to laboratory facilities and research opportunities in a vibrant small-school setting where faculty and colleagues take great pride in offering personalized mentoring and advising to our undergraduate students. FASTest LAB students are challenged and immersed in a collaborative, supportive, and nurturing environment made up of faculty, undergraduate students, lab assistants and technicians.

Research Assistantships (part-time or full-time), Financial Support, and Course Work as part of Research (CWR) or Research Work as part of Course (RWC) Opportunities

I am always interested in adding highly qualified, motivated, and hard-working students to the lab. To be considered for financial assistance of any form the following steps need to be taken first:

[1] Include a Personal Statement that describe why you want to study/work with Prof. Murat Dinc,

[2] Be admitted for undergraduate studies and be a Miami University student,

[3] Send me email (at dincm@miamioh.edu) with the following information: the degree program you have been admitted to, the semester you started, area of research interests, your cv/resume in pdf format.

If you are a current Bachelor's of Science degree pursuing Miami University student, then send me a document including your cv/resume, transcript(s), and interests of study areas. Upon receipt of this email I will evaluate your application for a possible research assistantship or internship.

Current and Future Research Topics (in Aerodynamics, and Thermal-Fluids areas)

  • Single drop, spray flow and spray cooling studies in thermal management area (current),
  • Aerodynamic analysis of ground vehicles (cars, trucks, buses, etc.) aiming for drag/lift coefficient and fuel consumption improvement studies (current),
  • Aerodynamic analysis of airplanes aiming for drag/lift coefficient studies (future),
  • Analysis of flow around structures (buildings, etc.) for wind trajectory studies under hazardous environmental conditions (e.g., High-wind speed, tornado) (future)

Resources

Computational Resources

  • Two business workstations in Thesken Hall to perform computational part of research activities. Will add more business workstations to increase computational capacity by creating a small-lab scale high-performance-computing (HPC) center.
  • Variety of computational tools to utilize in research and teaching activities.

Experimental Equipment at Thesken Hall

  • Subsonic wind tunnel
  • Pressure transducers, accelerometers, velocity probes and other measurement tools
  • 3D printers
  • High-speed cameras
  • Plan developing and constructing single drop and spray cooling experimental setups at Thesken Hall as part of future experimental research activities and supplemental teaching materials.

Subsonic wind tunnel with high-speed cameras

Subsonic wind tunnel with high-speed cameras

3D printers

3D printers

3d printed sedan

3D printed sedan car model (one of the DrivAer model) configuration. DrivAer car model CAD files.

Thermal-Fluid Dynamics Research:

There are four major parts in my thermal-fluid dynamics related research.

  1. Computational Fluid Dynamics Study of the Effect of Several Parameters on the Impact of a Drop onto Dry and Wet Surfaces under Isothermal Conditions
  2. Computational Fluid Dynamics Study of the Effect of Several Parameters on the Impact of a Drop onto Dry and Wet Surfaces under Thermal Conditions
  3. Computational Fluid Dynamics Study of the Effect of Several Parameters on the Impact of Sprays under Isothermal Conditions
  4. Computational Fluid Dynamics Study of the Effect of Several Parameters on the Impact of Sprays under Thermal Conditions (Spray Cooling)

Scope of Research: Single drops and sprays have many applications in biomedical, chemical and mechanical engineering (ink-jet, etc.). Sprays include millions of drop impingements per second on a surface. The impact of liquid drops and sprays onto both dry and wet surfaces has been studied by many researchers for more than a century but the complete understanding of this phenomenon is still lacking especially in thermal applications. This research includes part of single drop impact analysis and how some of the fluid and environmental parameters (e.g. gravity) may affect the single drop impact phenomenon.

Timeline: Fall 2020 and following semesters (once part 1) is completed, continue with parts 2), 3), and 4)).

Method: Computational Fluid Dynamics (CFD) approaches will be utilized. Commercially available ANSYS Fluent is the main resource of this research. ANSYS Fluent is utilized with two workstations (located in Dr. Dinc’s office) via remote access. Students can also access these workstations via remote access if needed.

Student Researchers: Planning to hire one or two students for 10 hours/week for Winter 2020 and Spring 2021 and later semesters depending on available funding.

Outcome of Research: Outcomes of this research is planned to be published and presented in journal-conference papers, symposiums (such as AIAA-DCASS), and Miami University Undergraduate Research Forum and other events and organizations at Miami University.

Sample of Single Drop Research:

Perform CFD Analysis of Single Drops and Investigate:

  • Effects of liquid properties on single drop impact,
  • Effects of gravity on single drop impact,
  • Effects of surface contact angle on single drop impact,
  • and more…

For more information about images and about sample research and other details, please contact Dr. Murat Dinc.

Effect of gravity on single drop impact on a flat, dry and smooth surface:

Initial and Boundary Conditions

Initial and Boundary conditions diagram. 

Computational Cells used:

To reduce the total number of computational cells, adaptive and dynamic mesh refinement is implemented in 2D axisymmetric coordinates.

Total number of cells = 250,000; total number of faces = 500,000

Domain is: y=25 mm (surface), x = 12.5 mm (height)

Smallest cell size = 0.0558 mm (D/40)

Largest cell size =0.223 mm

Initial Conditions for Multiphase Simulations: Red represents liquid phase (water at room temperature) and blue represents gas phase (air at room temperature). Initial drop diameter, Do = 2 mm; initial drop velocity, Uo = 1 m/s in all cases. Impact surface is flat, dry (initially), smooth and it has constant surface contact angle (110 degree).

Boundary Conditions:

Wall boundary conditions were implemented on the impact surface and side walls, and pressure outlet boundary condition was implemented on the top surface.

Dimensionless Parameters

Dimensionless numbers in engineering and physics are used for data reduction of similar problem. See important parameters used in drops and spays are:

Reynolds Number: 
RE equals U D over v

Froude Number: 
Fr equals U superscript 2 over g d

Weber Number: 
We equals pU superscript 2 D over o

Parameters used in gravity simulations
Case Gravity (m/s2) We Re Fr
1. Solar 275 27.3 2123 1.8
2. Jupiter 24.8 27.3 2123 20.2
3. Earth 9.81 27.3 2123 51
4. Lunar 1.68 27.3 2123 297.6
5. Asteroid
1999 R-36
0.038 27.3 2123 13, 157
Dimensionless Numbers: Drop impact in the absence of heat transfer is influenced by inertia, viscous, surface tension, and gravity forces.  Dimensional analysis reveals that the relevant dimensionless numbers may be taken to be the Reynolds number Re (proportional to the ratio of inertia to viscous forces), the Weber number We (proportional to the ratio of inertia to surface tension forces), and the Froude number Fr (proportional to the ratio of inertia to gravity forces). 

Why Asteroid 199R-36 Gravity?

  • Bennu (Asteroid 1999R-36) is Near-Earth Asteroid.
  • Bennu (Asteroid 1999R-36) is the target of the OSIRIS-REx mission which is intended to return samples to Earth in 2023 for further study. [1][2][3]
  1. Corum, Johnthan (8 September 2016). "NASA Launches the Osiris-Rex Spacecraft to Asteroid Bennu," The New York Times. Retrieved 9 September 2016.
  2. Chang, Kenneth (8 September 2016). "The Osiris-Rex Spacecraft Begins Chasing an Asteroid." The New York Times. Retrieved 9 September 2016.
  3. Brown, Dwayne; Neal-Jones, Nancy (31 March 2015). "RELEASE 15-056 –NASA's OSIRIS-REx Mission Passes Critical Milestone." NASA. Retrieve 4 April 2016.

Effects of Gravity (FR number)

  • Increasing gravity (decreasing the Fr number), increases maximum spread diameter. Time scales do not change.
  • Effects of gravity are not very significant for lower gravity range (between Asteroid (~0) – Earth (g))

Effects of Gravity Chart

Effects of Gravity (Fr number) line graph

Maximum Spread ratio or maximum dimensionless spread diameter is obtained using this equation: Dmax / Do  (maximum spread diameter / initial drop diameter)

The major outcome of the results: It is obtained from simulations that the effects of gravity (the Fr number) is very significant on maximum drop spread diameter especially at higher gravity values (lower Fr number cases). At lower gravity values (higher Fr number cases), the difference on the maximum spread diameter is not significant. 

Free Tutoring Services

Prof. Murat Dinc may offer students free tutoring via video conferencing (upon request and depending on the availability). Tutoring topics would include mathematics, geometry, analytical geometry, and physics-based courses. These courses are foundation of most of engineering technology courses and it is required to use them in most of the courses work.