Fluid Solid Interaction (FSI) analysis of 24 Lehman rear wing profile in high speed
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8 th Report - Ardalan Amiri - 840734 WING PROFILE AEROELASTICITY ANALYSIS USING FSI CFD and FEA are powerful tools in terms of inclusive engineering analysis yet there are quite a number of engineering applications that require more extensive viewpoint. Effect of passing fluid upon high speed automobile back wings structure is one of those fields demanding Fluid Structure Interaction analysis rather than applying fluid effects as user input loads on the structure. Here we have performed a sample analysis regarding the issue to quickly show case the feasibility of FSI technique and learn the necessary tools and information one needs to know to handle computational FSI analysis with Abaqus CFD/CAE packages. This method is also called “coupled analysis” in CAE terms. Theory and Data The followings are the standard formulations relating the fluid force exerted on the wing solid structure due to relative speed. They declare that, in a fixed fluid field, Drag and Lift forces induced on a car wing are not only functions of the velocity but also the angle of attack (through the coefficients) and shape of the wing. This analysis is essentially a 2D one. Purpose Investigating the effect angle of attack on the car wing deformability in the one dimensional high velocity field and obtaining the drag and lift coefficients for each case scenario. There are two case scenarios with 5 and 15 degrees of attack angle in 200 km/h. In this application, downward force is desirable for pushing the car against the ground in high speeds and drag force is only suitable for deaccelerations (braking situation) helping the vehicle to www.linkedin.com/in/ardalanamiri [email protected]
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Transcript of Fluid Solid Interaction (FSI) analysis of 24 Lehman rear wing profile in high speed
8th Report - Ardalan Amiri - 840734 WING PROFILE AEROELASTICITY ANALYSIS USING FSI
CFD and FEA are powerful tools in terms of inclusive engineering analysis yet there are quite a number of engineering applications that require more extensive viewpoint. Effect of passing fluid upon high speed automobile back wings structure is one of those fields demanding Fluid Structure Interaction analysis rather than applying fluid effects as user input loads on the structure. Here we have performed a sample analysis regarding the issue to quickly show case the feasibility of FSI technique and learn the necessary tools and information one needs to know to handle computational FSI analysis with Abaqus CFD/CAE packages. This method is also called “coupled analysis” in CAE terms.
Theory and Data
The followings are the standard formulations relating the fluid force exerted on the wing solid structure due to relative speed. They declare that, in a fixed fluid field, Drag and Lift forces induced on a car wing are not only functions of the velocity but also the angle of attack (through the coefficients) and shape of the wing. This analysis is essentially a 2D one.
Purpose
Investigating the effect angle of attack on the car wing deformability in the one dimensional high velocity field and obtaining the drag and lift coefficients for each case scenario. There are two case scenarios with 5 and 15 degrees of attack angle in 200 km/h. In this application, downward force is desirable for pushing the car against the ground in high speeds and drag force is only suitable for deaccelerations (braking situation) helping the vehicle to reduce speed more efficiently. Therefore, knowing that the angle of attack is adjustable during the car motion automatically and/or manually, we tried here to see the relation of attack angle on altering the mentioned forces imposed on the wing.
Method
By creating a coupled Multiphysics model involving air flow and wing solid structure, we simulated the desired speed situation with two mentioned different angle of attacks. Then we read the fluid flow force on the wing structure according to the fluid velocity direction to get the Lift and Drag forces. Knowing the fluid density, relative velocity and wing geometry, we were able to calculate the corresponding coefficients in two case scenarios of attack angle.
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FEA modelling process
Interaction Force Results
5 degree
Lift coefficient = 0.026
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Drag coefficient : 0.05
15 degree
Lift coefficient = 0.066
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End of 8 th report Ardalan Amiri Politecnico di Milano December 19 th 2016
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