User Tools

Site Tools


parasitedrag

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
parasitedrag [2018/05/03 15:12]
jgravett Adds GUI explanations and reorganized
parasitedrag [2018/05/03 15:30] (current)
jgravett Minor changes
Line 4: Line 4:
  
 ===== General Overview ===== ===== General Overview =====
 +
 $ c_i \equiv \mbox{Chord length at span station} $\\  $ c_i \equiv \mbox{Chord length at span station} $\\ 
 $ b_i \equiv \mbox{Section span} $\\ $ b_i \equiv \mbox{Section span} $\\
Line 24: Line 25:
 {{ :​parasitedraggui.png?​900 |}} {{ :​parasitedraggui.png?​900 |}}
  
-==== Parasite Drag Table ==== +Visible on all tabs of the GUI is the parasite drag table, which identifies individual components and their inputs in the parasite drag calculation. The table may be sorted by Component, S_wet, or % Total by selecting the toggles at the top of the table. Clicking on a geometry in the Component column of the table will break up the geometry into its surfaces and sub-surfaces. Below the list of components, excrescences are identifies, for which the Excrescence tab is available to add, remove, and adjust excrescences. Once the table has been setup, the "Calculate CDO" button on the bottom left of the GUI will run the parasite drag calculation. Once finished, the results will update in real time in response to changes in input values, such as the flow condition. However, if a component is added, removed, or modified, the tool must be rerun. The entire Parasite Drag table, excrescence list, and total results can be exported by selecting "​Export to *.csv"​. Next to this button, the Export Sub-Components toggle is available to include or ignore component breakup in the export file. On the bottom right of the GUI, the total form factor, drag coefficient,​ and percent contribution to total drag is listed for all components, excrescences,​ and the combination of both. 
- +
-Visible on all tabs of the GUI is the parasite drag table, which identifies individual components and their inputs in the parasite drag calculation. The table may be sorted by Component, S_wet, or % Total by selecting the toggles at the top of the table. Clicking on a geometry in the Component column of the table will break up the geometry into its surfaces and sub-surfaces. Once the table has been setup, the "CalculateCDO" button on the bottom left of the GUI will run the parasite drag calculation. Once finished, the results will update in real time in response to changes in input values, such as the flow condition. However, if a component is added, removed, or modified, the tool must be rerun. The entire Parasite Drag table, excrescence list, and total results can be exported by selecting "​Export to *.csv"​. Next to this button, the Export Sub-Components toggle is available to include or ignore component breakup in the export file. On the bottom right of the GUI, the total form factor, drag coefficient,​ and percent contribution to total drag is listed for all components, excrescences,​ and the combination of both. +
  
 === Wetted Area === === Wetted Area ===
Line 291: Line 290:
 {{ :​body_form_factor_api_output.png?​nolink |}} {{ :​body_form_factor_api_output.png?​nolink |}}
  
-==== Flow Condition ====+===== Flow Condition ​=====
  
 On the Overview tab, the Parasite Drag Tool includes several options for atmosphere models as well as the option for the user to have manual control over certain atmospheric qualities. The freestream type is identified by the choice labeled "​Atmosphere",​ and the sliders below will activate or deactivate depending on this selection. The first two freestream types are the US Standard Atmosphere 1976 and USAF 1966 atmospheric models, for which a comparison is shown below$^{16, 17}$. Note, the upper limit for the US Standard Atmospheric model is 84,852 meters, and the upper limit for the USAF model is 82,021 feet. Both require freestream velocity and altitude to be input, but an additional delta temperature input is available to offset temperature from the atmospheric model. The remaining atmosphere options require a series of manual inputs to calculate the atmospheric condition, but will not calculate and update the altitude slider. In addition, if the atmospheric choice type is "Re/L + Mach Control",​ no additional properties of the flow will be calculated (i.e. pressure and density). On the Overview tab, the Parasite Drag Tool includes several options for atmosphere models as well as the option for the user to have manual control over certain atmospheric qualities. The freestream type is identified by the choice labeled "​Atmosphere",​ and the sliders below will activate or deactivate depending on this selection. The first two freestream types are the US Standard Atmosphere 1976 and USAF 1966 atmospheric models, for which a comparison is shown below$^{16, 17}$. Note, the upper limit for the US Standard Atmospheric model is 84,852 meters, and the upper limit for the USAF model is 82,021 feet. Both require freestream velocity and altitude to be input, but an additional delta temperature input is available to offset temperature from the atmospheric model. The remaining atmosphere options require a series of manual inputs to calculate the atmospheric condition, but will not calculate and update the altitude slider. In addition, if the atmospheric choice type is "Re/L + Mach Control",​ no additional properties of the flow will be calculated (i.e. pressure and density).
parasitedrag.txt · Last modified: 2018/05/03 15:30 by jgravett