Week 9 - PCB Thermal Simulation

Aim To create a model for PCB - by importing the PCB layout, library files and traces to ANSYS Icepak - and perform thermal analysis of the same for the following three cases: 1. The model is solved only for conduction, without the components. 2. The model is solved for forced convection with the actual components. 3.…

I. Aim To buid the model for a low-voltage control-panel, as per the given specifications, and perform steady-state thermal analysis of the same. II. Introduction In the current project, the following tasks are performed: 1. The model for a low-voltage control panel is created in ANSYS Icepak using the following given…

I. Aim To design a low voltage control panel, as per the given specifications, and perform thermal analysis of the same. II. Introduction In the current project, the following tasks are performed: 1. The model for a low-voltage control panel is designed in ANSYS Icepak using the following given information: 1.1. The…

I. Aim To simplify the given CAD model of an electronic enclosure assembly and perform thermal analysis of the same. II. Introduction In the current project, the following tasks are performed: 1. The given CAD model is simplified into an Icepak model using the commands available in ANSYS SpaceClaim. 2. The model is imported…

I. Aim To perform thermal simulation of the given model of an electronic enclosure assembly. II. Introduction In the current project, steady-state simulation of the given model of an electronic enclosure assembly is performed using ANSYS Icepak. Suitable power generation values are assigned to various objects in the model…

I. Aim To simplify the given CAD model of an electronic enclosure assembly and perform thermal analysis of the same. II. Introduction In the current project, the following tasks are performed: 1. The given CAD model is simplified into an Icepak model using the commands available in ANSYS SpaceClaim. 2. The model is imported…

I. Aim Apply multi-level meshing to resolve the CAD objects in the given Icepak model, and reduce the original mesh count. II. Introduction The given Icepak model contains the following two CAD objects: i. SheetMetal_HS ii. guide_sweep-0_1.1 In order to resolve these CAD objects and avoid mesh bleeding the model employs…

I. Aim To perform CFD analysis of a model consisting of two heated plates, cooled by water circulating inside the cold-plate cavity, as well as by air driven by natural convection externally. II. Introduction In the current project, the following activities are performed: i. The model is designed in ANSYS Icepak using…

I. Aim To create a conformal mesh for the given Icepak model of an electronic enclosure assembly. II. Introduction In the current project, conformal mesh is created for the Icepak model shown in the image attached below. III. Theory Meshing discretizes the physical domain into elements/cells. Within each of these elements/cells…

I. Aim To perform geometry simplification of the given CAD model of an electronic enclosure assembly in ANSYS SpaceClaim and import it to ANSYS Icepak. II. Introduction In the current project the given CAD model of an electronic enclosure assembly is imported in SpaceClaim where the following steps are carried out: i.…

I. Aim i. To perform engine sector simulations with both the given pistons: Omega piston and Open-W piston. ii. To compare the Indicated Mean Effective Pressure (IMEP) and Engine Power for the two pistons. iii. To compare the emission characteristics (including Soot, `NO_x` and UHC) of the two pistons. II. Theory…

I. Aim  To perform full hydrodynamic simulation of a port fuel injected engine and calculate the following parameters: i. Compression ratio ii. Combustion efficiency iii. Engine power iv. Engine torque II. Given i. PFI geometry ii. Design inputs III. Theory Spray modeling: Modeling the fuel spray in the intake port…

I. Aim: To perform thermal analysis of a cabinet containing the following: (a) An array of five high-power devices (each source dissipates power at the rate of 33W) (b) A backing plate (c) Ten fins (d) Three fans (each fan has a total volumetric flow rate of 18cfm) (e) An opening The figure attached below shows the schematic…

Derivation and analysis of Reynolds-averaged Navier-Stokes equations I. Aim The aim of the current project is to: i. Apply Reynolds decompostion and Reynolds-averaging to the Navier-Stokes equations and derive the expression for Reynolds stress. ii. Explain Reynolds stress. iii. Explain turbulent viscosity. II. Theoretical…

Shock tube simulation project I. Aim: The aim of the current project is: 1. To setup a transient shock tube simulation. 2. Observe the pressure and temperature throughout the domain as a function of time. 3. Estimate the cell count as a function of time II. Theoretical background: Shock tube is a device used…

Conjugate Heat Transfer Simulation of Pipe Flow I. Overview In the current project conjugate heat transfer analysis of flow through a circular pipe is performed using CONVERGE CFD, with the following objectives: i. To study the effect of grid size on the simulation results: The following three grid sizes are used: (a)…

Prandtl-Meyer Shock Problem Overview The current report is divided into three sections. In the section I, a brief theoretical background of shocks and Prandtl-Meyer expansion fan is provided. Section II begins with an introduction to boundary conditions which are used in Mathematics to solve differential equations. Additionally…

Transient simulation of flow over a throttle body I. Overview In the current project, a transient simulation of flow over a throttle valve, placed in a pipe-elbow, is performed using CONVERGE CFD. II. Geometry The geometry used for performing simulation is attached below. III. Material Air (Predefined mixture) is used…

Steady state simulation of flow over a throttle body I. Overview In the current project, steady-state simulation of flow over a throttle valve, placed in a pipe-elbow, is performed using CONVERGE CFD. II. Geometry The geometry used for performing simulation is attached below. III. Material Air (Predefined mixture) is used…

Flow over a backward facing step I. Overview In the current project flow over a backward facing step is simulated using CONVERGE CFD. Simulation results for the following three meshes are compared: i. Mesh 1: Grid size: dx=dy=dz=2e-3m. ii. Mesh 2: Grid size: dx=dy=dz=1.5e-3m. iii. Mesh 3: Grid size: dx=dy=dz=1e-3m. II.…

Channel flow simulation using CONVERGE CFD I. Overview In the current project two dimensional channel flow is simulated using CONVERGE CFD. Simulation results for the following three meshes are compared: i. Mesh 1: Grid size: dx=2e-4m, dy=2e-4m and dz=2e-4m. ii. Mesh 2: Grid size: dx=1.5e-4m, dy=1.5e-4m and dz=1.5e-4m.…

Simulation of non-premixed combustion flame using ANSYS Fluent I. Overview In the current project non-premixed combustion flame is modeled using ANSYS Fluent. The flame utilizes methane gas with a certain amount of water content as the fuel and air (79% `N_2` and 21% `O_2` by volume) as the oxidizer. The mass fractions…

Parametric study of a gate valve using ANSYS Fluent I. Overview A gate valve is a mechanical device used to restrict the flow of the fluid through a pipe. It is mostly operated in two modes: fully open and fully closed. Hence it is not used for flow regulation. The image attached below shows a typical gate valve. Flow…

Simulation of cyclone separator using ANSYS Fluent Overview: Cyclone separator is a device used to remove particulate matter from flue gases. Air/flue gas containing particulate matter enters into the separator tangentially from the top and follows a downward-helical trajectory inside it. This creates a vortex at the center…

Two dimensional simulation of gearbox sloshing using ANSYS Fluent I. Overview In the current project, two dimensional simulation of slosh dynamics within a gearbox, consisting of two rotating spur gears, is performed using ANSYS Fluent. Such simulations are often performed in the industry to determine if all the gear teeth…

Simulation of Rayleigh Taylor instability using ANSYS Fluent I. Overview The destabilization of interface between two fluids of different densities, which occurs when the heavier fluid is placed on top of the lighter fluid under the effect of gravitational field, is termed as Rayleigh Taylor instability. Some examples…

Conjugate heat transfer analysis of a graphics card I. Overview In the current project, conjugate heat transfer analysis is performed on a given model of graphics card, using ANSYS Fluent. The following two meshes are used for simulation: (a) Baseline mesh (b) Refined mesh The aim of the analysis is to accomplish the following…

Conjugate heat transfer analysis of exhaust manifold The term \"conjugate heat transfer\" refers to scenarios wherein there is a combination of and coupling between heat transfer in solids and fluids. In solids heat transfer occurs mainly by conduction whereas in fluids convection is the dominant mode of heat transfer.…

Simulation of flow over an Ahmed body Ahmed body is a simplified car-model developed by S.R. Ahmed in 1984. It is quite simple to model and captures the flow features observed around actual complex car geometries well. Additionally experimental data, obtained by conducting wind tunnel experiments over Ahmed body, is also…

In the current project, flow over a circular cylinder is analyzed, using both steady state and transient approaches, in ANSYS Fluent. The goal is: (a) To simulate von Karman vortex street, which is an unsteady phenomenon that occurs during the laminar flow regime (at certain Reynolds numbers) causing repeated patterns…

I. Steady state analysis: Steady state conduction equation in two dimensional cartesian coordinate system is given below: `(del^2T)/(delx^2)+(del^2T)/(dely^2)=0` Upon discretizing the spatial derivatives using central difference scheme, we get: `(T_(i+1,j)-2T_(i,j)+T_(i-1,j))/(Deltax^2)+(T_(i,j+1)-2T_(i,j)+T_(i,j-1))/(Deltay^2)=0`…

In the current project, we will simulate flow through a mixing tee using ANSYS for the following three different configurations: (i) Short mixing tee with hot stream entering at `25^oC` and 3m/s and cold stream entering at `10^oC` and 6m/s. (ii) Long mixing tee with hot stream entering at `25^oC` and 3m/s and cold stream…

Simulation of flow through a pipe using OpenFoam part - II Given: The following information is available before starting the current project: 1. Physical description of the problem: (i) Diameter of the pipe, `D=0.01m`. (ii) Reynolds number of the flow based on the pipe diameter and the uniform inlet velocity, `Re_D=2100`.…

Simulation of flow through a pipe using OpenFoam In the current project, we are going to analyze the steady laminar flow of an incompressible fluid with constant properties in the fully developed region of a straight circular pipe. This flow is termed as Hagen-Poiseuille flow. 1. Physical description As soon as the fluid…

Interpolation Schemes In the finite volume formulation, evaluation of surface and volume integrals sometimes requires the values of unknown variables at locations other than the computational nodes of the control volume. These values are obtained by employing certain interpolation schemes. As an example let us consider…

Analysis of flow over a backward facing step (I) Geometry and Mesh For the current project, the computational domain is divided into five blocks. This is done to implement mesh grading near the walls in a convenient manner. In order to perform 2D analysis of the problem using openFoam, a dimension of 1 mm is considered…

Numerical solution of quasi one-dimensional subsonic-supersonic isentropic nozzle flow (I) Non-conservative form of governing equations 1. Grid independence study: It is necessary that the numerical solution of a physical problem remains unaffected by the number of grid points adopted for the purpose of numerical discretization.…

We need to derive a fourth order approximation for the second order derivative `f_i\'\'` 1. Central difference: Let us consider a five-point stencil consisting of the points `f_(i-2), f_(i-1), f_i, f_(i+1) and f_(i+2)`. Let us assume `f_i\'\'approx(af_(i-2)+bf_(i-1)+cf_i+df_(i+1)+ef_(i+2))/h^2`. Taylor table…