If you find errors in the program or would like to suggest improvements, please send an e-mail to [email protected]. FoilSim II is still available if you prefer the older version.
Airfoil Release Notes. Airfoil 5.8.8 Released on November 27th, 2019. Full MacOS 10.15. A memory usage issue was introduced in Airfoil 4.8.13, which could cause dropouts, disconnections, or hangs, in some circumstances. With automatic downloads.
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FoilSim is a simulation. It is not reality.
FoilSim is an educational computer program. It is not a design program. FoilSim was built to help students learn how wings work. It produces the correct trends (for example, doubling velocity will quadruple the lift and drag) but it does not give the exact value of lift or drag. FoilSim uses a very simplified analysis to calculate lift, and it interpolates experimentally measured drag data to determine the drag. The drag data was obtained by students using inexpensive models and an inexpensive wind tunnel. Please do not attempt to design, build, or fly a full scale aircraft using data from FoilSim. It is fine for models, but be careful.
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With this software you can investigate how an aircraft wing produces lift and drag by changing the values of different factors that affect lift and the factors that affect drag.
FoilSim Student JS is the latest (April 2019) version of the FoilSim family of interactive simulations. The different versions of FoilSim require different levels of knowledge of aerodynamics, experience with the package, and familiarty with computer technology. This web page contains the on-line student version of the FoilSim Student JS program. It includes an on-line user's manual which describes the various options available in the program and includes hyperlinks to pages in the Beginner's Guide to Aerodynamics describing the math and science of airfoils.
Download FoilSim StudentJS here. Elementary Version - FoilSim III
There is a special version of FoilSim for elementary students who are just beginning to learn about wings and airfoils. This version only lets you change the flight conditions and the geometry of the wing. Input is performed with buttons, so the student does not have to work the sliders, input boxes, and choice boxes of the student version. The only output are lift and drag gages in English units. Again, the student does not have to select types of output, or interpret graphs.
Student Version - FoilSim II
FoilSim II is still available for students who are learning about the lift of airfoils and wings. This version calculates the lift of an airfoil based on user inputs of flow conditions and wing geometry. Output is provided by a variety of plots, performance graphs, and text fields. But FoilSim II does not make any calculation of the drag of the wing. Undergraduate versions of FoilSim II are also available for college students.
Undergraduate Version - FoilSimU III
There is a special undergraduate version of FoilSim III for students who are studying computational modeling of airfoil problems. This version let you change some of the assumptions in the analysis and has additional graphics to view the details of the analysis. There are on-line and off-line applet versions of this program.
There are several other applets based on FoilSim. You can investigate the role of aerodynamics in pitching a baseball by using CurveBall, the curve of a soccer kick by using SoccerNASA, or wind tunnel testing techniques by using TunnelSys.
GENERAL INSTRUCTIONS
This program is designed to be interactive, so you have to work with the program. There are a variety of choices which you must make regarding the analysis and the display of results by using a push button or a drop menu. To operate a button, move the cursor over the button and left click with the mouse. The push buttons occur in groups, and the chosen option is shown as a yellow 'lighted' button. A drop menu has a descriptive word displayed in a box with an arrow at the right of the box. To make a choice, click on the arrow, hold down and drag to make your selection. The current values of the design variables are presented to you in boxes. By convention, a white box with black numbers is an input box and you can change the value of the number. A black box with yellow numbers is an output box and the value is computed by the program. To change the value in an input box, select the box by moving the cursor into the box and clicking the mouse, then backspace over the old number, enter a new number, then hit the Enter key on your keyboard. You must hit Enter to send the new value to the program. For most input variables you can also use a slider located next to the input box. Click on the slider bar, hold down and drag the slider bar to change values, or you can click on the arrows at either end of the slider. At any time, to return to the original default conditions, click the red Reset button at the upper right of the program.
SCREEN LAYOUT The program screen is divided into four main parts:
GRAPHICS
The View Window contains a schematic drawing of the wing that you are designing and some buttons to control the schematic drawing. Possible choices are colored blue while the selected option is colored yellow.
OUTPUT VARIABLES
There are several different output options available for the Output Window at the lower right. You select the type of output by using the push buttons on the control panel. The default setting is Plot and a graph will appear in the window. The type of graph is described below and you can vary the plot by using the Plot Selection input panel. If you display a plot and begin to change the input variables, it may become necessary to rescale the plot axes by pushing the white Rescale button at the lower left of the window. The types of available plots are listed below.
The Gages shows the current value of lift (or lift coefficient) and drag (or drag coefficient) displayed in scientific notation. The gages are displayed in the output window and move as the lift and drag are varied. This display shows the relative sensitivity of lift and drag to the input variables.
The Probe lets you explore the flow around the wing. A probe control panel appears in the output window when you select 'Probe' from the control panel. By default, the probe is turned off. You turn the probe on by pushing one of the white buttons on the probe panel. The probe itself will then appear in the view window. You change the location of the probe using the sliders to the left and below the gage on the probe panel. The value of the pressure or the velocity at the location of the probe tip (magenta ball on the view window) is displayed on the gage. Or a green trail of 'smoke' is swept downstream from the probe location. You turn the probe off by using the red button located above the gage.
The performance options provides a written list of important input and computed variables in the Output Window. You have two options for performance output; the Data option gives the computed lift, drag and flow conditions, the Geometry option shows the coordinates of the airfoil geometry and the local value of velocity and pressure. These numbers correspond to the plots of velocity and pressure described above.
Some additional output from the program is displayed on the Control Panel and some input panels. On the Control Panel, you can choose to display the lift or the lift coefficient by using the drop menu. Similarly, you can either display the drag or the drag coefficient. The value is displayed in the output box to the right of the drop menu. Lift and drag may be expressed in either Imperial (English) or metric units (pounds or Newtons). The Reynolds number is the ratio of inertial forces to viscous forces and affects the calculated value of the lift and drag. Reynold's number and lift to drag ratio are always displayed on the Control Panel. On the Flight Test input panel is a group of output boxes that give the atmospheric conditions of the air. The pressure, temperature, density, and viscosity will change depending on the altitude and planetary inputs. On the Size input panel the geometric aspect ratio of the wing is displayed. The aspect ratio is defined to be the square of the span divided by the wing area and is included in the calculation of induced drag.
INPUT VARIABLES
The input variables are located on input panels that are displayed at the lower left. You can select the input to display by using the push buttons on the control panel. You can choose to vary the Shape, the Size, or perform a Flight Test of a wing design. You can also display the Plot Selection Panel and a panel to control the Analysis used in FoilSim III.
NEW FEATURES
The NASA Glenn Educational Programs Office will continue to improve and update FoilSim III based on user input. Changes from previous versions of the program include:
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The Airfoil Bevelled Face Diffuser is a surface mounting model. The attractive 45 degree bevelled frame comes in standard white. It offers the advantage of a built-in anti-smudge frame for increased ceiling protection. All sizes are available with a fixing clip neck adaptor with a choice of spigot sizes to suit the flexible duct. Used in domestic and commercial capacities, the BD is extremely effective in providing an even spread of air across the target area.The Airfoil Bevelled Face Diffuser is a surface mounting model.
The attractive 45 degree bevelled frame comes in standard white. It offers the advantage of a built-in anti-smudge frame for increased ceiling protection.
All sizes are available with a fixing clip neck adaptor with a choice of spigot sizes to suit the flexible duct. Used in domestic and commercial capacities, the BD is extremely effective in providing an even spread of air across the target area. Airfoil’s Plastic Round is an attractive and high quality ceiling mounted diffuser used predominantly for domestic supply and exhaust applications. Airfoil’s Plastic Round is manufactured from high quality ABS polymers, which will ensure long term strength and rigidity. This will ensure that the surface will not discolour over time. The centre of the diffuser can be adjusted which will enable the user to conveniently and accurately balance the airflow.
The finish is standard ceiling white with an etched surface, which will act to minimise light reflections. Airfoil’s Down Jet Diffuser is suitable for ceiling mounted heating, cooling or ventilation applications. Available in 3 sizes, all models are constructed from A.B.S polymers providing long term strength and rigidity. The diffusers consist of a series of concentric rings that deliver the air downwards at a slight angle to the vertical. A centre knob is adjusted to control the airflow including a total shut-off.The airflow pattern is ideal for ceiling mounted heating applications where warm air is directed downwards from the down jet. The directional nature of the airflow improves the mixing of cooler air at lower levels.
The down jet is regularly used in ducted heating applications where under floor ductwork is not available, such as solid concrete floors.Standard finish is off-white with the surface has an etched face, which lowers light reflections, and ensures an unobtrusive finish. Airfoil’s Multi Directional Outlet is a plastic diffuser that comes complete with reducing neck and clips to attach to a gyprock ceiling. The diffuser is easy to install and cost effective. Commonly used in domestic applications the diffuser allows for the four biscuits which lay in its core to be interchanged.
This allows the diffuser to direct air flows in a multitude of patterns depending on the room requirements.The Multi Directional Outlet has a flushed faced appearance which gives a contemporary look and feel. Airfoil’s Bevelled Face Dump Diffuser is a highly functional 4 way blow style diffuser which is particularly useful in high ceiling applications. The eggcrate core in the centre of the diffuser will enable the supply air to reach the target conditioning range particularly in heating mode, whilst the outer diffusing blades will allow the air to achieve the desired coanda effect across the ceiling. The BD Dump Diffuser can be manufactured to any size upon request and is available in white semi-gloss powder coat as standard. The Airfoil Bevelled Face Diffuser is a surface mounting model.
The attractive 45 degree bevelled frame comes in standard white. It offers the advantage of a built-in anti-smudge frame for increased ceiling protection. All sizes are available with a fixing clip neck adaptor with a choice of spigot sizes to suit the flexible duct. Used in domestic and commercial capacities, the BD is extremely effective in providing an even spread of air across the target area.The Airfoil Bevelled Face Diffuser is a surface mounting model. The attractive 45 degree bevelled frame comes in standard white. It offers the advantage of a built-in anti-smudge frame for increased ceiling protection. All sizes are available with a fixing clip neck adaptor with a choice of spigot sizes to suit the flexible duct.
Used in domestic and commercial capacities, the BD is extremely effective in providing an even spread of air across the target area. Airfoil’s Plastic Round is an attractive and high quality ceiling mounted diffuser used predominantly for domestic supply and exhaust applications.
Airfoil’s Plastic Round is manufactured from high quality ABS polymers, which will ensure long term strength and rigidity. This will ensure that the surface will not discolour over time. The centre of the diffuser can be adjusted which will enable the user to conveniently and accurately balance the airflow. The finish is standard ceiling white with an etched surface, which will act to minimise light reflections. Airfoil’s Down Jet Diffuser is suitable for ceiling mounted heating, cooling or ventilation applications.
Available in 3 sizes, all models are constructed from A.B.S polymers providing long term strength and rigidity. The diffusers consist of a series of concentric rings that deliver the air downwards at a slight angle to the vertical. A centre knob is adjusted to control the airflow including a total shut-off.The airflow pattern is ideal for ceiling mounted heating applications where warm air is directed downwards from the down jet. The directional nature of the airflow improves the mixing of cooler air at lower levels. The down jet is regularly used in ducted heating applications where under floor ductwork is not available, such as solid concrete floors.Standard finish is off-white with the surface has an etched face, which lowers light reflections, and ensures an unobtrusive finish.
Airfoil’s Multi Directional Outlet is a plastic diffuser that comes complete with reducing neck and clips to attach to a gyprock ceiling. The diffuser is easy to install and cost effective.
Commonly used in domestic applications the diffuser allows for the four biscuits which lay in its core to be interchanged. This allows the diffuser to direct air flows in a multitude of patterns depending on the room requirements.The Multi Directional Outlet has a flushed faced appearance which gives a contemporary look and feel. Airfoil’s Bevelled Face Dump Diffuser is a highly functional 4 way blow style diffuser which is particularly useful in high ceiling applications. The eggcrate core in the centre of the diffuser will enable the supply air to reach the target conditioning range particularly in heating mode, whilst the outer diffusing blades will allow the air to achieve the desired coanda effect across the ceiling.
The BD Dump Diffuser can be manufactured to any size upon request and is available in white semi-gloss powder coat as standard.
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