Week 9 - Mini project - Flow over an Airfoil

Aim 1.Run the case at 1800 rpm and list down important parameters (20 Marks) air flow rate BMEP BSFC In-cylinder pressure   2. Increase the power output at 3600 rpm by 10%  Introduction Brake mean effective pressure (BMEP) Brake mean effective pressure (BMEP) is an average value of the pressure inside the…

Aim Describe Ahmed's body and its importance. Setup the domain and setup assuming body is travelling at 110 kmph Run the setup till convergence and plot for static pressure and coefficient of drag and lift to check for convergence Turn on Broadband- modelling and detail the acoustic field study over Ahmed body. Ahmed body…

Aim Simulate the motion of blades in a generic turbomachinery component using an unsteady approach. Assume blade rotation at 300rpm Choose an appropriate time step for the simulation and generate an animation file for the rotation Setup Pressure based Transient  In the cell zone conditions mesh motion is enabled for…

Aim Create domain for flow analysis Setup simulation for subsonic and supersonic regimes at                      ○5, 10, 15 angle of attack  Domain Domain was created in ICEM cfd and the mesh sizes of cell near…

What are the approaches by which you would model moving zones? Moving Mesh method Reference frame method Which approach would you use to model unsteady phenomena? Moving mesh method Simulation Setup The mesh file is loaded on to fluent Stead state pressure based simulation is chosen in viscous models K-epsilon -Realizable-enhanced…

Turbulance Models Spart Allmaras the Spalart–Allmaras model is a one-equation model that solves a modelled transport equation for the kinematic eddy turbulant viscosity. The Spalart–Allmaras model was designed specifically for aerospace applications involving wall-bounded flows and has been shown to give good…

Aim To simulate a flow through a converging-diverging nozzle Inlet pressure as 1 bar and temperature as 300 k Outlet pressure as 0.027 bar Introduction A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow. Ramjets and rockets typically use a fixed convergent section followed…

Aim 1. A pitot static tube geometry is attached below.     a.You are required to do a literature review of pitot-static tube. Also establish a relationship between Total (stagnation) pressure and static pressure     b.You are required to create surfaces and fill it separately for Total pressure port…

Aim/Objective Surface Mesh the given solid with different grid lengths for each parts Create wind tunnel for CFD applications and surface mesh it Procedure First geometry checkup is done Overlapping sirfaces are deleted Surfaces which does not have the influence on the shape of the body are removed in order avoid forming…

Aim/Objective To do surface wrap over assembled parts (engine , transmission and gear box)  Procedure First the model is loaded on to Ansa  unwanted surface are deleted without damaging the outer shape of the geometries single cons are resolved mainly here as it would affect negetively on the surface wrapping…

Aim/Objective Surface Mesh the given solid with different grid lengths for each parts Create wind tunnel for CFD applications and surface mesh it Procedure The geometry is cut into half exvluding logo Then geometry checkup is done Overlapping sirfaces are deleted Surfaces which does not have the influence on the shape…

Aim For the given model, check for the geometrical errors to make appropriate volumes. Create and assign PIDs . Perform surface mesh with the given target lengths as per PIDs. Blade stage-1 = 1 mm Blade stage-2 = 1 mm Impeller = 2 mm Shaft rotor = 1 mm Turbo casing = 5 mm Compressor casing = 5 mm Inlet casing cover = 5…

Aim For the given model, check for the geometrical errors and perform Topology cleanup accordingly. Set three different target lengths as three different cases and mesh the model.  Target length = 1mm, 3 mm and 5 mm (i.e. 3 cases) Element type = Tria Apply any one target length from the above at a time for the entire…

Aim Run an aerodynamic flow simulation over an FSAE car in two phases First phase consist of setting up a coarse simulation  For the second phase this should be done in two cases, One in which the car is traveling through a lot of turns and another case with car travelling in straight road Phase 1 Case setup Firstly the…

Aim  Run an external flow simulation on Ahmed body Create the geometry file Extract coefficient of drag values from the paraview Extract the x component of velocity along a line Compare the experimental data and simulation data for validation Ahmed body   Ahmed's body is a generic form of the car body that…

Aim To simulate flow over airfoil Extract Lift force and Drag force Plot Coefficient of drag Vs angle of attack Plot coefficient of lift vs angle of attack Compare two turbulance models from the above results Airfoil A solid body moving through a fluid produces an aerodynamic force. The component of this…

Aim Setup a transient shock tube simulation Plot the pressure and temperature history in the entire domain - Explain the result Plot the cell count as a function of time - Explain the result Shock Tubes The shock tube is an instrument used to replicate and direct blast waves at a sensor or a model in order to…

Aim Baseline configuration Setup a flow simulation through a pipe Inlet Reynolds number should be 7,000  Re = (rho*V*D)/(Dynamic viscosity) Turbulence modelling - K-Epsilon Supercycling parameters - same as in the video Additional 3D outputs Add Y+ to post.in file Grid dependence test Start with an initial base…

Aim Setup a simulation to capture the shock wave Show the created mesh Effenct of SGS on the solution Explain the shock wave theory Define boundary conditions and physics behind the shock wave Shock wave Is a strong pressure wave found in any elastic medium such as air, water etcetra . They are formed when the pressure…

Aim Setup a transient simulation  Post process the results and show pressure and velocity contours. Show the mesh (i.e surface with edges) Show the plots for pressure, velocity, mass flow rate and total cell count. Also show the calculations on how you calculated an end time for the simulation. Create an animation in which…

Aim Post process the results and show pressure and velocity contours. Show the mesh (i.e surface with edges) Show the plots for pressure, velocity, mass flow rate and total cell count. Create an animation in which it throttle movement should be visible. Introduction A throttle is the mechanism by which fluid flow is managed…

Aim To simulate an airflow through a backward facing step using converge Simulate through three different cases by changing only mesh size Show the mesh of each cases Post-process the results and obtain pressure and velocity contours To plot mass flow rate, Velocity and pressure Why separation is taking place  When…

Aim To setup a steady state channel flow Run the simulation for 3 different cases of mesh sizes Obtain plots for velocity, pressure,mass flow rate and total cell count for all 3 base mesh sizes. Upload an animation to youtube and attach the link here using the add media option. Explain the development of the flow using…

Aim Perform a combustion simulation on the combustor model and plot the variation of the mass fraction of the different species’ in the simulation using line probes at different locations of the combustor as shown in Fig. You need to plot for CO2, H2O, CH4, N2, O2, NOx emissions & Soot formation.  As a second…

Objectives perform a parametric study on the gate valve simulation by setting the opening from 10 % to 80%.  Obtain the mass flow rates at the outlet for each design point. Calculate the flow coefficient and flow factor for each opening and plot the graph. Discuss the results of the mass flow rate and flow coefficient. …

Aim:- To perform analysis on cyclone separator and calculate the separation efficiency and pressure drop.   Objective:- To write a few words about any four empirical models used to calculate the cyclone separator efficiency.  To perform an analysis on a given cyclone separator model by varying the particle…

Aim  To conduct a CHT analysis on graphics card Objectives Run the simulation by varying the velocity from 1m/sec to 5m/sec for at least 3 velocities and discuss the results. Find out the maximum temperature and heat transfer coefficient attained by the processor. Prove that the simulation has achieved convergence…

Objectives What are some practical CFD models that have been based on the mathematical analysis of Rayleigh Taylor waves? In your own words, explain how these mathematical models have been adapted for CFD calculations. Perform the Rayleigh Taylor instability simulation for 2 different mesh sizes with the base mesh being…

Aim To conduct Heat transfer coefficient analysis on exhaust pipe of a four cylinder engine Objectives:   Give a brief description of why and where a CHT analysis is used. Maintain the y+ value according to the turbulence model and justify the results.  Calculate the wall/surface heat transfer coefficient on…

Aim To simulate the flow over an ahmed body  Expected Results: 1. Velocity and pressure contours.  2. The drag coefficient plot for a refined case. ( For velocity of 25m/sec, the drag coefficient should be around 0.33). 3. The vector plot clearly showing the wake region.  4. Perform the grid independency…

Aim Explain the phenomenon of Karman vortex street.     Simulate the flow over a cylinder ( with steady and unsteady case) Calculate the strouhal number for Re = 100 Ccalculate the coefficient of drag and lift over a cylinder by changing the values of Re by 10,100,1000,10000 & 100000(Use steady…

Aim: To conduct a mixing Tee simultaion through following cases Case 1  Short mixing tee with a hot inlet velocity of 3m/s. Momentum ratio of 2, 4.  Case 2  Long mixing tee with a hot inlet velocity of 3m/s. Momentum ratio of 2, 4. Further comparison of following values from two cases (through table) Cell…

Expected Results Validate Hydro-dynamic length with the numerical result Validate the fully developed flow velocity profile with its analytical profile Validate maximum velocity and pressured drop for fully developed flow Post-process Shear stress and validate wall shear stress for fully developed flow Highligh the differences…

Main objective In this challenge, you will simulate an axi-symmetric flow by applying the wedge boundary condition. The flow is laminar and flows through a constant cross-section pipe at an inlet Reynold's number of 2100. You can do a transient or steady state simulation and you will validate your results with the Hagen-…

Finite Volume Method The finite volume method (FVM) is a method for representing and evaluating partial differential equations in the form of algebraic equations.  In the finite volume method, volume integrals in a partial differential equation that contain a divergance term are converted to surface integrals,…

Aim Simulate an incompressible-laminar-viscous flow through the backward facing step geometry. Perform a transient simulation.  Explain the entire simulation procedure (how you set up the case). Provide explanations to every change you make inside the reference case files obtained from OpenFOAM tutorials. flow is…

Subsonic-supersonic Nozzle   The flow at inlet to the nozzle comes from a reservoir where the pressure and temperature are denoted by `p_0` and `T_0` respectively. The cross-sectional area of the reservoir is large (thearotically A tends to infinity) and hence the velocity is very small and is value near…

We use taylor table to find the higher order approximations. This table is designed in a way to take out the terms and use it effectively to find out the coefficients. Suppose we want to find fourth order approximation of a second order derivative. We can find it using the information from the neighbouring points. We can…