Week 3.2 - Simulating a 2nd order ODE system of a simple pendulum Aim : Illustrating the motion of a pendulum, by a predefined 2nd order ODE. The program starts by giving inputs (damping constant, length, etc.), thereafter the initial condition is defined as 0 displacement and initial 3 rad/s angular velocity. In order…

PROJECT TITLE : Calculation of the steady flight parameters and performance prediction of an UCAV AIM : To determine the change in variables during an un-accelerated flight. OBJECTIVE : The primary emphasis lies on calculation of various data and making assumptions of a few. METHODOLOGY : For the present work, in order…

Week 5.1 - Mid term project - Solving the steady and unsteady 2D heat conduction problem Aim : To visualize the 2D Steady state and Unsteady state (with different techniques) diffusion problem in a domain. 1. Condisering the steady state problem:- The two dimensional steady state equation is given as,  `(del^2T)/…

Week 2.1 - Air standard Cycle Aim :  The given program is regarding calculating thermal efficiency of the Otto cycle and plotting four thermodynamic processes on a p-v diagram. To begin with, the program starts by predefinition of Input variables, State variables, Engine's parameters, and follows up by calculating…

Week 2.13 - Literature review of Boundary and Initial Conditions Aim : Providing an explanation of Initial and Boundary Conditions, with types of Partial Differential Equations. Whenever a differential equation is solved, it may have many solutions, for case of the general solution having arbitary constants, say c1 adn…

Week 3.3 - Discretization basics Aim : Compareing the first, second and fourth order approximations of the first derivative against the analytical or exact derivative. The given program is about discretizing a specific function, and showing the error in approximation between analytical and numerical derivatives. To begin…

Week 3.4 - Discretization for range of dx Aim : To compute the first, second and fourth order approximations for a range of 'dx', for a given function and is a continuation of the previous program.  Firstly, in order to evaluate the approximations, a particular value of 'x' and a "range of dx" is defined. For instance,…

Week 4.1 - Linear Convection for varying number of nodes Aim - To describe the behaviour of 1D Linear Convection equation for a varying number of nodes. The program starts by defining the input parameters like domain length, nodes, convection speed and time step size and follows by creating a mesh by linspace 'command'.…

Week 4.2 - Linear Convection for varying timesteps Aim : To create a function which considers the different values of time steps for a fixed set of parameters. The program starts by defining the parameters as domain length, nodes, convection speed and the length is discretized as X-axis thru linspace command with 80 nodes,…

Week 5.2 - Mid term project - Steady vs unsteady state analysis Aim : Comparison of both the steady and unsteady equation solving methods and explanation.  1. For the Steady state case: From the previously done program, it is clear that the 2D steady state analysis of the conduction problem consumes less time…

Week 5.3 - Mid term project - Stability analysis in the unsteady problem AIM : To determine the impact of change in CFL number on the unsteady state solution.   The CFL or Courant Number comes into picture where the problem is time marching. The CFL Number is given as; `CFL = alpha(Δt)/( Δx^2)`…

Week 9 - FVM Literature Review Aim : Review of the Finite Volume Method Since, the Finite Difference Method is simple to use for discretization of grids, it cannot be put into practice if the grid structure is not completely aligned along axes.        However, some interpolations can be made, to…

Introduction to GUI based CFD using Ansys Fluent Week 1- Mixing Tee Aim :- To simulate the air flow thru a T-shaped pipe having two inlets and to determine mixing behaviour based on change in fluids' momentum ratio. Theory :- T-shaped pipe has two inlets, having incoming air at different velocities and temperatures and…

Introduction to GUI based CFD using Ansys Fluent Week - 2 : Flow over a Cylinder Objective : To simulate the flow over a cylinder and visualize the effect of vortex shedding at different Reynolds Number. To begin with, a 2D geometry is created in Spaceclaim with a cylinder, here as cross sectional view of circle with…

Introduction to GUI based CFD using Ansys Fluent Week - 3 : External Flow Simulation over an Ahmed body Objective : To simulate the flow over a body as to capture the near surface effects and visualize the vortices formed at the rear. The Ahmed body, is a car model to analyze and capture essential features of the…

Introduction to GUI based CFD using Ansys Fluent Week - 4 : CHT Analysis on Exhaust port CHT Analysis: Conjugate Heat Transfer involves exchange of thermal energy between fluid and solid interface. Such analysis is carried out for heat exchangers, cooling of electronic equipments, cooling and heating systems, exhaust…

Introduction to GUI based CFD using Ansys Fluent Week 5 - Rayleigh Taylor Instability   Instabilities in Fluid Dynamics: 1. Rayleigh Taylor instabilityThis interfacial instability between two phase of fluid, with different densities occurs when the lighter fluid is pushing the heavier fluid. 2. Richtmyer-Meshkov instabilityThis…

Introduction to GUI based CFD using Ansys Fluent Week 7 - Simulating Fluid Sloshing effect inside a Gear-box Dynamic meshing: The application of Dynamic meshing comes into use when the domain (or say the structured grid) is changing with time because of motion. The motion here can be linear or rotational based on…

Introduction to GUI based CFD using Ansys Fluent Week 8 - Simulating Cyclone separator with Discrete Phase Modelling Empirical models of cyclone separator: 1. Iozia and Leith Model Iozia and Leith model is a modified version of is developed based on the force balance. The model assumes that a particle carried…

Introduction to GUI based CFD using ANSYS Fluent Week 6 :- CHT Analysis on a Graphics card To begin with, the 3-D CAD model of the graphic card is loaded in Spaceclaim and its geometry has following components. All of these components are enclosed inside an enclosure. SpaceClaim setup: The topology of all the sub-parts…

Introduction to GUI based CFD using ANSYS Fluent Week 9 :- Parametric study on Gate valve   Gate valve is used for allowing the desired flow rate via channel, by lifting up the gate disc. It basically gets operated by handwheel. Such valve is used for oil, gas, slurries, steam and corrosive liquids Tand are suitable…

Advanced Aerodynamic Simulations using Converge Studio Week 1 :- Channel flow simulation using CONVERGE CFD Geometry setup and preprocessing: For the case, in order to simulate a simple airflow inside a rectangular closed passage, a duct is created with width and height of 0.1 metre and length of 0.1 metre, with normal `vecn`…

Advanced Aerodynamic Simulations using Converge Studio Week 3 :- Flow over a backward facing step Pre-processing: For this challenge, the CAD model of '.stl' format of the backward facing step is loaded in the Converge Studio and is scaled by a factor of 0.001. In the nexy stage, multiple boundaries are created. The boundaries…

Advanced Aerodynamic Simulations using Converge Studio Week 4.1 Project :- Steady state simulation of flow over a throttle body Geometry setup and Pre-processing: For the given project, a geometry of '.stl' file is loaded in Converge Studio. Since the imported geometry is not suitably captured by the CAD environment, few…

Advanced Aerodynamic Simulations using Converge Studio Week 4.2 Project :- Transient state simulation of flow over a throttle body Geometry setup and Pre-processing: For the given project, a geometry of '.stl' file is loaded in Converge Studio. Since the imported geometry is not suitably captured by the CAD environment,…

Advanced Aerodynamic Simulations using Converge Studio Week 5 Project :- Prandtl Meyer Shock problem Shock-wave theory: Shockwaves are pressure waves having large amplitude, that are created when the flow is faster than the speed of sound, i.e. with a velocity of more than 340 m/s or the Mach Number (M) greater than…

Advanced Aerodynamic Simulations using Converge Studio Week 6 Project :- Conjugate Heat Transfer Simulation Conjugate Heat Transfer is referred when there is more than one way for the heat transfer to occur, like via conduction for solids and convection for fluid. Converge uses the Solid heat equation to deal with…

Week 2 - Converging diverging nozzle Objective: To determine the variation in thermodynamic quantities thru the C-D Nozzle. Procedure:  For the geometry, as per the provided details, a 2-D plane with required dimensions is created in SpaceClaim.                    …

Week 3 - Pitot Tube In aviation, the most common technique for determining an aircraft's airspeed, Mach number, altitude, and altitude trend is a pitot-static system, which consists of pressure-sensitive equipment. A static port, pitot tubes, and pitot-static instruments are the standard components of a pitot-static system.…

Week 8- Moving zones approach in Fluent Basically there are two approaches that can be utilized to model the "Moving Zones/Frames" in Ansys Fluent. There are discussed as follows: 1. Moving Reference Frame Here the frame will be in motion and the mesh topology will remain the same There is no change in the Control Volume…

Week 9- Unsteady Moving Zones Approach   The present problem is the continuation of previous problem specification, with a slight modification. Here the case is ran as a time marching problem.  The mesh files are appended as a case in Fluent and cell zone conditions are defined as fluid for all. Boundary Conditions:…

Week 5 - Turbulence Modelling challenge Attaining the Critical Reynolds Number in a flow, the 'Energy Cascading' takes place, where the larger eddies break down to smaller eddies. * Types of eddies: Large eddies Their size is proportional to ratio of (Characteristic length/ Free stream velocity);  `size prop…

Week 11 - Broadband Noise Modelling over an Ahmed Body The Ahmed body is a car model, that was proposed in 1984 by Ahmed et al., and it serves as a benchmark to compute external flow analysis. The Ahmed body creates the essential elements of the flow pattern surrounding an automobile, such as flow separation and wake production…

Week 2 - Meshing of a Pressure Valve The CAD model imported to ANSA contains many geometry errors. Hence field services are patched to form regular surface. Here required existing surface, planar surface and fitted surfaces are created using selection of single entities or loops selections. Geometry Clean-up Now the geometry…

Week 7 - Minor Project Geometry Setup: The project starts by importing the .DAT file of NACA0012 airfoil to ICEM CFD.   After that all the points are joined by forming a curve.   Secondly the parts are created for the air fold surfaces. In the next stage the domain length is defined by creating the points around…

Week 3 - CFD Meshing of a Turbocharger Topology cleanup: The model when loaded into ANSA, contains a lot of geometric errors hence the topology cleanup was performed first. Here as seen in the pictures the single cons are fixed by creating new surfaces as per fitted surfaces and coons. At the locations where the entire…

Week 4 - CFD Meshing of a BMW car Topology Clean-up: The CAD model of the car when loaded into the ANSA software, showed up a lot of geometric errors having incomplete single connected surfaces and additional triple connected surfaces. So it was required to clean up the unwanted surfaces and set up the geometry properly.…

Week 5 - Surface Wrap on an Automotive Assembly Geometry Clean-up 1. Engine: The entire Assembly consists of three parts mainly engine gearbox and transmission. When the model is loaded it contains a lot of geometric errors like single connected surfaces and triple connected surfaces hence to proceed further it is required…

Project 1 : CFD Meshing of Tesla Cybertruck Topology Clean-up The model when it loaded into software contained a lot of geometrical errors like open single connected surfaces and intersecting surfaces, hence it was necessary to clear the things out. For the model's surface, topology is build up again and the internal features…