ANSYS FLUENT - KÁRMÁN VORTEX STREET

Aim To do a mesh on the given model and check for the geometrical errors to make appropriate volumes and to create and assign PIDs. To 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…

1) Ahmed body and its importance The Ahmed body is a generic car body (a simplified vehicle model). The airflow around the Ahmed body captures the essential flow features around an automobile and was first defined and characterized in the experimental work of Ahmed [1]. Although it has a very simple shape, Ahmed body allows…

Aim  To simulate the motion of blades in a generic turbomachinery component using an unsteady approach.   Procedure    1) Import the part mesh to fluent and use Append to import the rest of the component meshs. 2) To do a unstedy simulation for a rotating mesh we use Moving mesh approach. 3) K-epsilon…

Aim To do surface meshing on the given pressure valve.   Procedure   1) Import the given model into ANSA   2) Perform geometry checks     3) After fixing all the error continue to next step.   4) Before starting with the meshing apply boundary conditions to the model   Internal Components…

1) The approaches by which we would model moving zones are Moving reference frame Moving mesh approach. We also have few models under moving reference frame Single Reference Frame model (SRF) Multiple Reference Frame model (MRF) Mixing Plane Model (MPM) Sliding Mesh Model   2) To model unsteady phenomena we use moving…

Aim To create domain for flow analysis and analyse at 3 different angles of attack and the lift and drag coefficient.   3D cad model   Mesh Mesh size 40 mm   Boundary Conditions     Models used  Solver - Pressure based  Velocity formulation -  Absolute Time - Steady 2D space…

1) Various turbulence models in modern engineering applications. Spalart–Allmaras (S–A)The Spalart–Allmaras model is a one-equation model that solves a modelled transport equation for the kinematic eddy turbulent viscosity. The Spalart–Allmaras model was designed specifically for aerospace applications…

Objective To simulate an external aero simulation over MB Actros with & without container with a Speed of 33.33 m/s and to find the Drag and Lift Coefficient     Models   MB Actros   MB Actros without trailer     Surface Repair From the above image we can see the number of errors so a…

Aim To plot the Angle of attack vs Lift coefficient curve for the NACA 0012 from 0 to 15 for every 2 degree intervals   Procedure Stage 1 Modelling : Naca Wing 1) Import the file using Import CAD button from the menu bar. Naca Wing   Block (Wind Tunnel)   1) Right click on Parts > New shape part >…

Aim To calculate the total and static pressures and find the error in percentage for velocity for the given values of velocity. Velocity(m/s) Gauge Pressure (Pa) 240 -2817 100 33287 62 67580   Introduction A pitot tube is a flow measurement device used to measure fluid flow velocity. It is widely used…

Aim To study the variation of mach number for different altitude and also to study the variation of Mach number across the domain and at what distance from the inlet does the flow become supersonic and to compare with the analytical results.   Introduction A de Laval nozzle (or convergent-divergent nozzle, CD…

Aim To 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 and to observe the results when water content is in the fuel from 5% to 30%.   Theory A gas burner…

Model   Fluid Volume(Done to extract volume where fluid will flow)   Mesh   Models Chose Time - Steady Flow - Turbulent(K-epsilon) Dynamic mesh  Material injected - Anthracite    Case 1 Reflect Residuals   DPM   Particle Tracking    Vortex Core Region   Case 2 Trap…

Aim To perform a parametric study on the gate valve simulation by setting the opening from 10% to 80%.   Model   Fluid volume The fluid volume is generated to get rid of the unwanted solid regions which doesn't affect the fluid flow. We us Spaceclaim to generate it.   Mesh Base size = 10 mm   mesh cross-section…

Aim  To perform the four simulations in the Gearbox for the following cases 20% Immersion, Fluid - Engine oil. 30% Immersion, Fluid- Engine oil. 20% Immersion,Fluid-n-heptane (c7h16). 30% Immersion,Fluid-n-heptane (c7h16).   Introduction In fluid dynamics, slosh refers to the movement of liquid inside another…

Objective To perform a steady state conjugate heat transfer analysis on a model of a graphics card.   Introduction A video card (also called a display card, graphics card, display adapter, or graphics adapter) is an expansion card which generates a feed of output images to a display device (such as a computer monitor).…

Objective To perform the Rayleigh Taylor instability simulation for 3 different mesh sizes.   Solvers &  models used Pressure based solver Transient  Gravity  Fluids used air & water Miltiphase model VOF    Geometry   Case 1 Mesh size = 0.5 mm No. of elements = 3200 Time step…

Objective To perform a CHT analysis on a model of an exhaust manifold and to compare the solutions for 2 sizes of meshes   Geometry Solid model     Fluid volume B.C Inlet velocity = 5 m/s Inlet temperature = 700K Fluid = Air Solid body = Aluminium Solid body Temperature = 300K Solid heat transfer coefficient…

Objective To run both steady and transient flow simulations of flow over a cylinder for Reynolds number 100.   Abstract This simulations done is to understand the von karman vortex street of a cylinder, through experimenting we come to know that this effect is created for Re 100. We simulate for steady & transient…

Objective  To simulate flow through a mixing tee for various cases Case 1 (60 points) Short mixing tee with hot inlet velocity of 3m/s Momentum ratio of 2 Case 2 (60 points) Long mixing tee with hot inlet velocity of 3m/s Momentum ratio of 2 Case 3 (60 points) Short mixing with hot inlet velocity of 3 m/s Momentum…

1) The default errors checked in Surface Repair   1) Pierced Edges This error occurs when a face that is intersected by one or more edges of another face. This can be rectified by deleting the unwanted face and patching it properly. (Pierced Edges colored in red)   2) Face quality This error occurs when the ratio…

1.Ahmed body The Ahmed body is a generic car body (a simplified vehicle model). The airflow around the Ahmed body captures the essential flow features around an automobile and was first defined and characterized in the experimental work of Ahmed. Although it has a very simple shape, Ahmed body allows us to capture characteristic…

Surface remesh is needed when the model is having poor face quality and when it is not meshed properly.  The Surface Remesh remeshes the model and resolves Face quality and face proximity errors & give a proper triangulated mesh        2) Surface Remesher  Aim  To remesh the surface…

1) Need of wrapping We do wrapping when there is lot of surface errors & which cannot be rectified in less time  For example - A ford engine before & after surface wrapping   Surface errors before wrapping   Surface errors after wrapping   If you see the above photos in the first photo we have…

Aim  To model a pipe with radius 10 mm and lengths 50 mm for the below diagram     Stage 1 Modelling : Pipe We model the geometry using the 3D CAD modeler in STAR CCM+   1) Open the simulation, Expand Geometry, right click on the 3D CAD Modeler and select New 2) The modeling window will open, select…

Aim To model a cube of side 10 mm and construct a domain around it for external aero simulations.   Procedure Stage 1 Modelling : Cube We model the geometry using the 3D CAD modeler in STAR CCM+   1) Open the simulation, Expand Geometry, right click on the 3D CAD Modeler and select New 2) The modeling window…

1) Types of meshers 1) Tetrahedral Mesher  It is used for internal flow simulation, it is the fastest and uses the least amount of memory for a given number of cells. It has maximum of four faces   2)Polyhedral Mesher It is also used for internal flow simulation, it provides a balanced solution for…

Objects chose for the simulations Sphere Hemisphere Cube Angled cube   1)Sphere Aim  To model & mesh the required sphere   Procedure   Stage 1 Modelling Sphere  We model the geometry using the 3D CAD modeler in STAR CCM+   1) Open the simulation, Expand Geometry, right click on the 3D…

Aim To model air flow through a backward facing step & to run simulations for Reynolds numbers of 100 , 1e5, 1e7 & use laminar, Realizable k –epsilon  and Realizable k – omega models.    Procedure Stage 1 Modelling : Backward facing step We model the geometry using the 3D CAD modeler…

Aim To solve 2D steady and unsteady heat equation.   Program & explanation   2D steady state equation  `(d^2T)/(dx^2) + (d^2t)/(dy^2) = 0` In this challenge we are trying to solve 2D steady & transient heat conduction over a square, for this we use different iterative methods to find the temperature…