Sensitivity Analysis

Code used in latex: \documentclass{article} \usepackage[utf8]{inputenc} \usepackage{graphicx} \title{Adding Temperature equation to icoFoam} \author{Aditya Bantwal} \date{10th August 2022} \begin{document} \maketitle \newpage \section{Introduction} In this study, the transport equation for temperature is modelled using…

Code used in Latex:\documentclass{article} \usepackage[utf8]{inputenc} \usepackage{graphicx} \title{Creating a custom IOObject using Visual studio code} \author{Aditya Bantwal} \date{August 2022} \begin{document} \maketitle \newpage \section{Introduction} In this study, the total pressure field is computed in the pitzDaily…

`(dels)/(delt) + nabla.(us) = 0`   To start, first the solver icoFoam is copied to the user solver directory. Next, it is renamed to scalarFoam. This is executed using the following commands, while being present in the user solver directory: cp -r ~/openfoam/OpenFOAM-v2106/applications/solvers/incompressible/icoFoam .…

Introduction In a previous study, found here, a PFI engine was tested with a no hydro case setup, i.e. a study was performed to ensure the mesh and setup worked fine. In this study, the fully hydro setup will be performed and certain parametrers are analyzed. Objectives 1. Identify compression ratio 2. Identify combustion…

Introduction Before running a simulation in Converge CFD, there exists a lot of geometry clean up and testing. In this project, the simulation is run for an IC engine to ensure that the mesh and valve movement appear to be qualitatively correct. Aim Geometry cleanup Setting up a no-hydro case in Converge CFD for an IC…

Introduction In this study, a shock tube simulation is set up using low and high pressure regions using Converge CFD. The results are post processed using paraview and the animations are visualized to view the effect of gaseous phase mixing.  Aim To setup a shock tube simulation Setup A shock tube geometry is created…

Introduction Continuing from a previous study where a steady state case was performed click here to view , in this study, a transient analysis is performed to visualize the variation of pressure and velocity through time. Aim To idenitfy a time duration for the flow development. To set up a transient study of flow…

Introduction In this study, supersonic flow will be studied using Converge CFD. Before doing so, the following topics will be discussed in brief: Shock waves  Neumann boundary conditions 1. Shock waves: Supersonic flow occurs when the speed of fluid is much greater than the speed of sound in the same medium,…

Introduction A throttle valve is a device which can be used to regulate the air-fuel mixture in an engine. It can be fully opened or closed, depending on the need. In this study a steady state simulation is performed for a throttle valve using converge CFD. Aim Set up and run the steady state simulation for flow over throttle…

Introduction Converge CFD is a relatievely new computational software that offers a smooth and efficient graphical user interface to set up different cases of study. In this simple project, a simple flow through a channel will be set up using Converge, and the results will be post processed using both converge and PARAVIEW.…

Introduction A backward facing step is a simple and cannonical CFD analysis problem. The idea is simple, flow is allowed to enter from an inlet, and as the cross sectional area increases, the smooth flow simply becomes turbulent. Due to the unfavorable pressure gradient formation with increase in area, there is a detachment…

Flow simulation over an Ahmed body Aim: To simulate flow over an Ahmed body by creating a wind tunnel enclosure. To study the flow of air over an Ahmed body and identify the values of drag for different levels of mesh refinement. To understand the phenomenon of the wake region and its associated effects. To understand…

Introduction  We have a gri30 mechanism that contains 325 elementary reactions that could occur during combustion process. Using a sensitivity analysis, one can analyse how the sensitivity of each reaction is different for different parameters like temperature, pressure, concentration, etc. This could be useful in…

Introduction A mixture requires the right conditions to burn. Everything should be correct – Temperature, Pressure, Fuel-Air mixture, etc. Auto-Ignition is the lowest temperature at which the mixture combusts. Before Auto-Ignition, there exists a period called ignition delay, that is the time before which combustion…

Introduction Adiabatic flame temperature is the highest temperature that can be obtained in a combustion process during a constant pressure/ constant volume cycle. Since there is no heat loss, finding out the adiabatic flame temperature can be useful to find the maximum possible temperature that a fuel can reach during…

Introduction A recuperator is a device where hot air from flue gases is used to pre-heat air that is supposed to mix with fuel. Heat transfer can occur through radiation, or through combustion. Aim In this study the following will be analyzed and studied: 1. The effect of preheating adiabatic temperature from (298 to 600K)…

Aim To simulate the isentropic flow through a quasi 1D subsonic-supersonic nozzle by the Macormack method using MATLAB To obtain the following plots:         1. Steady-state distribution of primitive variables inside the nozzle        2. Time-wise variation of the primitive variables …

Introduction In this project, the 2D heat conduction equation is simulated and studied using implicit and explicit schemes for steady and unsteady conditions using MATLAB. `(delT)/(delt) + alpha((del^2T)/(delx^2) + (del^2T)/(dely^2) ) = 0` The steady state form of this equation would be: `alpha((del^2T)/(delx^2) + (del^2T)/(dely^2)…

Parsing of NASA's thermodynamic data using MATLAB Parsing of a file means reading inputs in the form of a data file, and storing this data. NASA has created a data file called THERMO.dat, which contains detailed information about 53 different species, and their coefficients. These coefficients can be used to obtain meaningful…

Conjugate Heat Transfer in an exhaust port Aim: To understand the phenomenon of Conjugate heat transfer To simulate the flow in an exhaust manifold To obtain a visual representation of the process by plotting the velocity and temperature contours Introduction: Generally, in solid objects, heat transfer occurs by conduction…

Cyclone Separator and its efficiency 1.0 Introduction A cyclone separator is a low cost device used by industries to separate out small particles present in a gas carrier. The principle involves the use of centrifugal force generated by the carrier as it passes through the separator to separate out the particles. Dirty…

Rayleigh-Taylor Instability Introduction Rayleigh-Taylor instability is an instability that occurs at the interface of a mixture of two fluids of different densities. In case a heavier fluid rests atop a lighter one, under the influence of gravity it moves downwards, while the lighter fluid moves upwards, as shown in the…

Introduction Combustion modeling and simulation is a very common study that is performed using CFD in recent times. The availability of powerful CFD packages such as Ansys Fluent allows for this. Many properties and observations can be identified and carefully studied by performing simulations using CFD. For example, Soot…

Introduction: The motion of a pendulum is a very commonly studied phenomenon. It involves understanding the variation of angular velocity and angular displacement with respect to time.  The equation of motion for a pendulum is a second order differential equation. Here,  g = gravity in m/s2, L = length of…

Introduction The Otto cycle is an idealized thermodynamic cycle that is commonly found in automobile petrol engines. It involves spark ignition, where constant volume heat addition and heat rejection takes place. Pressure and volume at each state i, would be pi, vi Generally, when studies are performed for an Otto cycle,…

Gate Valve Parametric Study Introduction A gate valve (also called sluice gate) is a valve that can obstruct or restrict the flow of fluid through a pipe. It can be completely opened, or it can completely be closed or be at intermediate positions, thus controlling different flow rates. Its application is to usually only…

GEARBOX SLOSHING INTRODUCTION Dynamic meshing involves conditions where the cell boundaries move relative to each other within a geometry. In this case, two gears will be revolving and hence to study any associated effects, while a mesh will be created, during the simulation the parameters and characteristics of the mesh…

Conjugate Heat Transfer Analysis on a Graphics card Introduction Conjugate heat transfer analysis involves analyzing and studying the interactions of thermal energy between solid and fluid materials. Using Ansys Fluent, this phenomenon can easily be simulated and studied. CHT analysis has many applications, such as in…

Flow over a cylinder and study of the Karman Vortex Street effect Aim: To simulate the flow over a cylinder and to study the effect of the Reynolds number in leading to the occurrence of vortex shedding. Objectives: To compare the Reynold’s number influence on vortex shedding To understand the phenomenon of drag…

Mixing efficiency Aim: To compare the effectiveness of mixing when the hot inlet temperature is 36⁰C and cold inlet is at 19⁰C Introduction: A mixing tee involves the flow of air from two different inlets at different temperatures. This allows for diffusion or mixing of the air. This experiment involves estimating how…