NUMERICAL FLOW SIMULATION Mini-Project P2 - CollaborationValidation and verification study of aerodynamic flow around a NACA 2412 airfoilEPFL Group 7HARAM Maren - CommunicatorSEPEHRI Yamin - MonitorGRAF Rafael - PlannerMUREN Lars - Allocatorwith the collaboration of Hepia student 4 COLLOT GuillaumeOctober - November 2017Project Plan:• definition to be coordinated by group “planner”• should include the following elements:• general description of project• required tasks Rafael : contact HEPIA student All: read the documents Lars: draft project plan Plan: • distribution of individual roles to group members• distribution of tasks amongst group members• resources (hardware, software) available to perform project• deliverables• project schedule
General Discription of Project In this project, we will examine the air flow behavior around a NACA 2412 airfoil. This will be done through experimental, theoretical and numerical analysis. The experimental study in the subsonic windtunnel in Geneva will be carried out by a Hepia student, while computer calculation, simulation and visualization will be done by us at EPFL. We will study the drag, lift and pressure coefficients at different angles of attack and compare the different results obtained through the different types of analysis. The first main required task of the project will be to analyse the flow around the airfoil with the resources available: the softwares XFOIL and Ansys FLUENT, and an experimental study in the Hepia Air Tunnel. The second main task will be to compare the different results obtained and communicate this through a scientific report.
OverviewIn this project, manufacturing of an industrial part will be modeled. Catia software will be used in order to define tool paths for a 2.5D axes machining tool and the results will be shown in this report. At first, we will show operation 4 in details as an example of our work. In this operation, definition of the tool used, method and important parameters of cutting will be explained. After that, by the aid of precise figures, the result of the simulated part will be shown under tolerance of 0.1 mm for penetration and residual materials. It is worth mentioning that we attached the Catia files to this report and they can be find in the zipped folder (open the 'Group_20' file in CATIA)1. Operation 4This operation consists of six sub-operations, which are made with the Milling machine WILLEMIN W408. According to the specifications of the WILLEMIN W408 and the requirement , we define the end mill type and related parameters. The main information and data are shown below:Stroke X axis: 350mm Stroke Y axis: 300mm Stroke Z axis: 299mm Rapid feed rate: 10m/min Spindle Power: 3.3kW Spindle speed range: 50-14000rpmNumber of tool: 4 Diameter: 18mmLength of cut: 80mm Spindle speed n : 3537r/min Machining speed vf : 990mm/min Width of cut ae : 9mm Depth of cut ap : 5mm Number of passes: 51.1 Operation 4.1 ; Roughing of the open pocket This operation is the roughing of the open rocket. According to the diameter value Dc = 18mm, we use a mill CoroMill Plura 216.34-18030-AS24N with zn = 4 tooth. Fig.1 is the definition of this mill tool. This will lead to a 5-passes machining with the width of cut of 50% DC or ae = 9mm for each pass. The following is calculation and choosing process of related parameters.