Study of turbulent flow over a heated stationary and moving cylinder and compilation of its effects on the effective Reynolds number and Strouhal number

Project Title

Study of turbulent flow over a heated stationary and moving cylinder and compilation of its effects on the effective Reynolds number and Strouhal number

Project Area of Specialization Mechanical EngineeringProject Summary

A relationship between effective reynolds number and strouhal number is to be established using CFD analysis for turbulent flow over a heated cylinder. The project finds its applications in the field of Aerospace industry(aerodynamics and heat transfer) , Heat Exchangers and many other fields.

Flow over a Cylinder has always been a classical problem in the field of fluid dynamics. A lot of research has already been conducted as far as laminar flow over a heated cylinder is concernedHowever, very less research is available for turbulent flow over heated cylinders. This project is directed to establish a relationship between eff. Re. No. and St. No.. Heat transfer mechanism can also be explored using the study.

The project would be divided into three phases listed below. • Define a geometry of a cylinder in Fluent with a heated profile. • Visualize and solve the problem for obtaining pressure, velocity and temperature profiles. • Obtain the shedding frequency of the vortex shedding phenomenon and then define a relation for eff-Re and St. numbers

Project Objectives

The project would be divided into three phases listed below. • Define a geometry of a cylinder in Fluent with a heated profile. • Visualize and solve the problem for obtaining pressure, velocity and temperature profiles. • Obtain the shedding frequency of the vortex shedding phenomenon and then define a relation for eff-Re and St. numbers

Project Implementation Method

Phase 1 : Define a geometry of a cylinder in Fluent with a heated profile

In the first phase a cylindrical geometry is to be formed in ANSYS Fluent. A certain temperature profile will be given to the geometry obtained and appropriate mesh will be generated in order to obtain maximum coverage in the exclusive and important zones.

Phase 2 : Visualize and solve the problem for obtaining pressure, velocity and temperature profiles In this phase, obtained geometry will then be solved in Fluent for obtaining the desired parameters like pressure gradient, velocity gradients and the temperature effects. Theses obtained valued are then to be used in order

Phase 3 : Obtain the shedding frequency of the vortex shedding phenomenon and then define a re-lation for eff-Re and St. numbers In the final phase the obtained valued will then to be used in order to obtain the most important factor that is the shedding frequency ’f’. This shedding frequency will give us the value for St. No. which can then be used to obtain a comparative study of the variation of St. no with eff. Re. no and to define a relation between them.

Benefits of the Project

Circul?r cylinders c?n be t?ken ?s the b?sis to study m?ny import?nt phenomen? in different fields such ?s he?t tr?nsfer, fluid mech?nics ?nd ?erodyn?mics etc. This import?nce comes from the f?ct th?t most of these field dem?nd the used of bodies with blunt sh?pes. In the field of ?erosp?ce, the most import?nt p?rt of ?ny flying body is the ?irfoil. It is ?lso c?lled ?s the he?rt of the ?ircr?ft. The front edge of ?n ?irfoil c?n be t?ken ?s ?n extension of ? cylinder. So, underst?nding the properties ?nd effects on the circul?r cylinder would pretty much sum up ?nd predict the flow over ?n ?irfoil ?nd hence ? wing. Simil?rly, in the field of he?t tr?nsfer, he?t exch?ngers hold prime import?nce. Flow dyn?mics h?s been ? field of interest since long. Leon?rdo d? Vinci g?ve his f?mous p?inting (Figure 1) in which he demonstr?ted the w?ter vortices. The p?inting is shown in figure. Since then, the vortex gener?tion h?s been ?n import?nt concept to study ?nd explore. ?s f?r ?s vortex gener?tion in p?rticul?r is concerned, it c?n ?lso be termed ?s ? dr?g since the flow is losing its energy in order to gener?te vortices. However, modern d?y technologies help us in h?rvesting energies from these vortices ?s well. Flow induced vibr?tions ?re yet ?nother field of concern where the underst?nding of the vortex shedding phenomenon is going to help us in controlling these vibr?tions ?nd m?y help in ?voiding c?t?strophes in some c?ses.

Technical Details of Final Deliverable

Flow over ? cylinder h?s ?lw?ys been ? cl?ssic?l problem for investig?tors in the field of ?erodyn?mics ?nd he?t tr?nsfer. The interesting developments in the regions close to the cylinder help underst?nd m?ny import?nt concepts ?s well ?s help in predicting m?ny p?r?meters rel?ted to different fields of interest. For inst?nce, the flow behind ?n ?irfoil c?n be t?ken ?s ? modified extension of flow over ? cylinder. This p?per t?kes into consider?tion the turbulent flow behind ? he?ted cylinder ?nd then tries to predict the beh?vior of the flow behind the cylinder ?nd hence the rel?tionship between the effective Reynolds number ?nd Strouh?l number. The rel?tion will be derived using CFD b?sed simul?tions. Trends will be studied for different rot?tion?l velocities ?nd temper?tures of the cylinder. The shedding frequency of the flow will be given speci?l consider?tion ?nd the focus will be on to est?blishing ? rel?tionship between the effective Reynolds number ?nd Strouh?l number.

Final Deliverable of the Project Software SystemCore Industry EducationOther IndustriesCore Technology OthersOther TechnologiesSustainable Development GoalsRequired Resources