A Novel Method that uses Light to Test Aerodynamics

Aerodynamics is a very important topic which has uses in a wide array of fields and is involved in things that range from bridges to spacecrafts. Despite this, most aerodynamic tests are performed only one of two ways, using extremely expensive wind tunnels or by using CFD (computational fluid dynamics) simulation. Both of these preexisting methods have flaws however, with wind tunnels costing gargantuan amounts of money and CFD methods consuming large amounts of energy. These flaws have prompted scientist and engineers to actively seek new solutions and methods that will help to address the cost and energy issues associated with the other two methods. This search has been to no avail so far as new novel methods have not been found until now. I have found a new method that concerns the use of light in order to test the aerodynamics of objects. To prove the feasibility, I have experimented using this method and have found it to accurately simulate aerodynamics behavior in all cases tested by me. This discovery is rather significant as it would lead to a substantial shift in the field of testing aerodynamics.

Lift Force of Airfoil (NACA 0012, NACA 4612, NACA 6612) With Variation of Angle of Attack and Camber: Computational Fluid Dynamics Study

Airfoil is a cross section from air plane wings can affect aerodynamic performance to lift force (FL). The lift force generated by airfoil has different values due to several external and internal factors, including angle of attack, flow rate and camber. To find the lift force of airfoils with different cambers and variations angle of attack and then flow rate can use computational fluid dynamics simulation. Computational fluid dynamics is simulation on a computer that can complete systems for fluid, heat transfer and other physical processes. This research using computational fluid dynamics simulation performed by SolidWorks, with NACA airfoil type which has different camber NACA 0012, NACA 4612 and NACA 6612. The angle of attack used in research was 0o, 4o, 8o, 12o, 16o and 20o. Flow rate used in research was 20m/s, 40 m/s, 60 m/s, 80 m/s and 100 m/s. From this research will be the bigger camber can produce a greater force lift. In addition, the greater airfoil flow rate can produce a greater force lift. This research also that the connection between force lift with coefficient lift (CL) is nonlinear quadratic form.

Stability of the Interface Between Two Immiscible Liquids in a Model Eye Subject to Saccadic Motion

The interface between silicone oil and saline layers in a 3D model of the eye chamber was studied under different eye-like saccadic motions in order to determine the stability of the interface and propensity for emulsification in the bulk. The effect of level of fill; saccade amplitude, angular velocity, latency time; and orientation were investigated experimentally in spherical flasks with internal diameters 10, 28 and 40 mm, as well as a 28 mm diameter flask with an indent replicating the lens or the presence of a buckle. The deformation of the interface was quantified in terms of the change in its length in 2-D images. The deformation increased with Weber number, We, and was roughly proportional to We for We > 1. The presence of the lens gave rise to higher deformation near this feature. In both cases emulsification was not observed in either bulk fluid. The velocity profile in the spherical configuration was mapped using particle imaging velocimetry and is compared with an analytical solution and a short computational fluid dynamics simulation study. These confirm that the saccadic motion induces flow near the wall in the saline layer and significantly further into the chamber in the silicone oil. Surfactants soluble in the aqueous and oil phases reduced the interfacial tension, increasing deformation but did not lead to emulsification in the bulk.

Computational fluid dynamics simulation of buoyant mixing of miscible fluids in a tilted tube

Buoyancy-driven flows and mixing of fluids with different densities occur frequently both in nature and as part of industrial processes within chemical and petroleum engineering. This work investigates the buoyant exchange flow of two miscible fluids in a long tube with closed ends at varying tilt angles using OpenFOAM. The study focuses on the evolution of the concentration field and front velocities of the mixing zone at different inclinations. Numerical results based on a miscible solver agree with previous experiments and direct numerical simulations. Treating the fluids instead as immiscible with no surface tension leads to unrealistically high front velocities at intermediate inclinations.