User Tools

Site Tools


files

Differences

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

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
files [2012/01/24 18:00]
ramcdona [csv]
files [2019/09/05 23:02] (current)
cibin [csv] Add section on DegenGeom.m with Octave example
Line 9: Line 9:
 VSP uses its own file format for airfoil points. ​ Some example airfoil files are included in the '​airfoils'​ directory of the distribution. ​ The example file representing a NACA 23015 is included below. VSP uses its own file format for airfoil points. ​ Some example airfoil files are included in the '​airfoils'​ directory of the distribution. ​ The example file representing a NACA 23015 is included below.
  
-The file starts out with a simple header. ​ The first line is a comment field, it is unused by VSP.  The second line is the airfoil name which will be displayed in VSP.  The third line is a flag to indicate a symmetrical airfoil. ​ The fourth and fifth lines specify the number of points which define the upper and lower surfaces.+The file starts out with a simple header. ​ The first line is a file-format identifying header which must contain "​AIRFOIL FILE"; otherwise, it is unused by VSP.  The second line is the airfoil name which will be displayed in VSP.  The third line is a flag to indicate a symmetrical airfoil. ​ The fourth and fifth lines specify the number of points which define the upper and lower surfaces.
  
 The surfaces are given as a series of (x, y) pairs. ​ The top surface first, then the bottom surface. ​ Points are specified from leading edge to trailing edge.  There is a blank line between the two sets of points. The surfaces are given as a series of (x, y) pairs. ​ The top surface first, then the bottom surface. ​ Points are specified from leading edge to trailing edge.  There is a blank line between the two sets of points.
Line 104: Line 104:
 Vorlax case file describing the flight condition and solver parameters to be used for analysis. Vorlax case file describing the flight condition and solver parameters to be used for analysis.
 ==== csv ==== ==== csv ====
 +
 +== CompGeom.csv ==
  
 When CompGeom is executed, it can produce a wetted area/volume report file in a comma-delimited spreadsheet ready file as CompGeom.csv. ​ This file contains the same information as CompGeom.txt. ​ An example of this file for a simple model is included below. ​ The theoretical areas and volumes are the untrimmed values for each component. ​ The Wetted areas and volumes are the trimmed values for each component. When CompGeom is executed, it can produce a wetted area/volume report file in a comma-delimited spreadsheet ready file as CompGeom.csv. ​ This file contains the same information as CompGeom.txt. ​ An example of this file for a simple model is included below. ​ The theoretical areas and volumes are the untrimmed values for each component. ​ The Wetted areas and volumes are the trimmed values for each component.
Line 114: Line 116:
 Totals,​83.000565,​68.289142,​14.270749,​12.743678 Totals,​83.000565,​68.289142,​14.270749,​12.743678
 </​file>​ </​file>​
 +
 +== DegenGeom.csv ==
 +
 +When DegenGeom is executed, it can produce a coordinate definitions file of degenerate geometries like the surface, plate, stick and point models as detailed [[http://​www.openvsp.org/​wiki/​lib/​exe/​fetch.php?​media=degen_geom.pdf|here]]. Panel and wing camber surface coordinates,​ panel areas, and similar information are available. This ASCII file can be opened using Excel or editors like Notepad++ and may also be parsed for discretization of geometries in several different physical applications such as Euler-Bernoulli beam theory and vortex lattice solvers. This file contains the same information as DegenGeom.m.
 +
 +==== dxf ====
 +
 +[[https://​www.autodesk.com/​techpubs/​autocad/​acadr14/​dxf/​dxf_reference.htm|AutoCAD DXF]] is a drawing format developed by Autodesk for CAD. The feature lines of a vehicle in VSP form the basis for DXF exports. 3D and 2D representations are available. For a 2D drawing, up to 4 views can be laid out in a single DXF. Additional options are available to add color to layers (identified up by geometry), force feature lines at all cross-sections,​ and add projection outlines. ​
 +
 +==== facet ====
 +
 +Similar to the *.tri file format, a Facet file contains the triangulated mesh data for a surface. Two methods are available for exporting a Facet file from VSP.
 +
 +  - Unintersected components (Comp Geom): File->​Export->​Xpatch (.facet)
 +  - Intersected components (CFD Mesh): Analysis->​CFD Mesh->​Output->​.facet
 +
 ==== fel ==== ==== fel ====
  
Line 216: Line 234:
  
 Background images can also be displayed when editing a fuselage cross section. ​ Finally, JPEG images can be used as textures applied to the surface of the model. Background images can also be displayed when editing a fuselage cross section. ​ Finally, JPEG images can be used as textures applied to the surface of the model.
 +
 +==== m ====
 +
 +== DegenGeom.m ==
 +
 +When DegenGeom is executed, it can produce a coordinate definitions file of degenerate geometries like the surface, plate, stick and point models as detailed [[http://​www.openvsp.org/​wiki/​lib/​exe/​fetch.php?​media=degen_geom.pdf|here]]. This file can be opened using [[https://​www.mathworks.com/​products/​matlab.html|Matlab]] or [[https://​www.gnu.org/​software/​octave/​|GNU Octave]] and may be used for discretization of geometries in several different physical applications such as Euler-Bernoulli beam theory and vortex lattice solvers. Panel and wing camber surface coordinates,​ panel areas, and similar information are available in a structure array data type named ''​degenGeom''​. This file contains the same information as DegenGeom.csv. ​
 +
 +An example of Unnamed_DegenGeom.m file executed in Octave is included below.
 +
 +<​file>​
 +octave:​1>​ Unnamed_DegenGeom
 +octave:​2>​ degenGeom
 +degenGeom =
 +
 +  1x2 struct array containing the fields:
 +
 +    type
 +    name
 +    geom_id
 +    surf_index
 +    main_surf_index
 +    sym_copy_index
 +    flip_normal
 +    transmat
 +    surf
 +    plate
 +    stick
 +    point
 +
 +octave:​3>​ size(degenGeom(1).surf.x) ​  % Size of array containing x-coordinates of surfaces in Component 1
 +ans =
 +
 +    6   33
 +</​file>​
  
 ==== msh ==== ==== msh ====
Line 227: Line 279:
 ==== obj ==== ==== obj ====
  
-Reasonably standardized ​triangulated surface file format.+[[http://​www.martinreddy.net/​gfx/​3d/​OBJ.spec|Wavefront object file]]. ​ VSP can sore a triangulated surface ​in a an OBJ file.  Only vertex '​v'​ and face '​f'​ data is output.
  
 ==== poly ==== ==== poly ====
  
-Surface file used as input for TetGen. +VSP can output a surface mesh in a format appropriate ​for the [[http://​tetgen.berlios.de/​|TetGen]] volume mesher. ​ This file is output in TetGen'​s own [[http://​tetgen.berlios.de/​fformats.poly.html|POLY]] format.
 ==== srf ==== ==== srf ====
  
Line 246: Line 297:
  
 STL files contain a large amount of redundant information. ​ Consequently,​ they can be very large for a given model -- as much as six times the size of other ASCII formats. STL files contain a large amount of redundant information. ​ Consequently,​ they can be very large for a given model -- as much as six times the size of other ASCII formats.
 +
 +==== svg ====
 +
 +[[https://​www.w3.org/​TR/​SVG11/​|SVG]],​ or Scalable Vector Graphics, is an XML-based 2D vector representation of an image. In VSP, an SVG drawing of a vehicle can be exported, which can then be opened using any web browser. Similar to DXF export, options are available to force feature lines at all cross-sections or add projection outlines. Up to four views are supported for an SVG export.
 +
 ==== tga ==== ==== tga ====
  
Line 263: Line 319:
 ==== tsv ==== ==== tsv ====
  
-  * Drag buildup report ​(tsv)+When CompGeom is executed, it can produce a drag buildup report ​file as a tab-delimited file as DragBuild.tsv.  An example of this file for a simple model is included below.  ​
  
 +In addition to the theoretical and wetted area and volume data included in the other CompGeom reports, the DragBuild.tsv file also includes other information such as thickness-to-chord ratios and fineness ratios which are commonly used in a drag buildup.
  
 +<​file>​
 +Name   ​Theo_Area ​  ​Wet_Area ​  ​Theo_Vol ​  ​Wet_Vol ​  ​Min_Chord ​  ​Ave_Chord ​  ​Max_Chord ​  ​Min_TC_Ratio ​  ​Avg_TC_Ratio ​  ​Max_TC_Ratio ​  ​Ave_Sweep ​  ​Length ​  ​Max_Xsec_Area ​  ​Len_Dia_Ratio
 +Pod_0   ​30.309323 ​  ​28.052179 ​  ​8.222844 ​  ​7.930860 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000
 +Ms_Wing_0 ​  ​26.345621 ​  ​20.118482 ​  ​3.023952 ​  ​2.406409 ​  ​1.999990 ​  ​2.999995 ​  ​4.000000 ​  ​0.120000 ​  ​0.120000 ​  ​0.120000 ​  ​44.999980 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000
 +Ms_Wing_0 ​  ​26.345621 ​  ​20.118482 ​  ​3.023952 ​  ​2.406409 ​  ​1.999990 ​  ​2.999995 ​  ​4.000000 ​  ​0.120000 ​  ​0.120000 ​  ​0.120000 ​  ​44.999980 ​  ​0.000000 ​  ​0.000000 ​  ​0.000000
 +</​file>​
 +Note: in this example the tab characters have been replaced with three spaces to facilitate proper display in various browsers.
 ==== txt ==== ==== txt ====
  
 == CompGeom.txt == == CompGeom.txt ==
  
-When CompGeom is executed, it can produce a wetted area/volume report file as CompGeom.txt. ​ An example of this file for a simple model is included below. ​ The theoretical areas and volumes are the untrimmed values for each component. ​ The Wetted areas and volumes are the trimmed values for each component.+When CompGeom is executed, it can produce a wetted area/volume report file as CompGeom.txt.  This file contains the same information as CompGeom.csv.  An example of this file for a simple model is included below. ​ The theoretical areas and volumes are the untrimmed values for each component. ​ The Wetted areas and volumes are the trimmed values for each component.
  
 <​file>​ <​file>​
Line 296: Line 360:
  
 Native VSP parametric geometry definition. ​ The VSP file is saved in XML format and can be relatively easily read, parsed, and updated. Native VSP parametric geometry definition. ​ The VSP file is saved in XML format and can be relatively easily read, parsed, and updated.
 +
 +
 +==== x3d ====
 +
 +Model for 3D web.  X3D is an XML successor to VRML.
 +
 +
  
  
files.1327456821.txt.gz · Last modified: 2018/04/01 14:40 (external edit)