Start-up Defaults
XFOIL has hardwired parameters (in subr. INIT) controlling the paneling, plotting, and viscous execution. Most of these can be changed at runtime in the various menus. To avoid the need to change the parameters everytime XFOIL is executed, they can be saved to the default file xfoil.def with the WDEF command at TOP LEVEL. This file has the format:
140 1.0000 0.1500 0.2000 | Npan PPanel TErat REFrat
1.0000 1.0000 1.0000 1.0000 | XrefS1 XrefS2 XrefP1 XrefP2
10.0000 0.5500 0.0150 0.8500 | Size plotAR CHsize ScrnFr
11.0000 8.5000 0.0000 0.0000 | Xpage Ypage Xmargn Ymargn
F T | Lcolor Lcursor
1.0000 -2.0000 -0.5000 | CPmax CPmin CPdel
0.0900 0.7000 | XoffAir ScalAir BLUwt
0.0000 1.5000 0.5000 | CLmin CLmax CLdel
0.0000 0.0200 0.0100 | CDmin CDmax CDdel
-4.0000 10.0000 2.0000 | ALmin ALmax ALdel
0.0000 0.3000 0.1000 | CMmin CMmax CMdel
1 0.0000 0.0100 | MAtype Mach Vaccel
1 0.0000 9.0000 | REtype Re/10^6 Ncrit
1.0000 1.0000 | XtripT XtripB
Line 1: Paneling parameters from the PPAR menu
Line 2: Paneling refinement locations
Line 3: Specifies the absolute plot size, the plot aspect ratio,
and scales the character, number, and symbol heights
Line 4: Defines page size and page margins, in inches
Line 5: Flags for color PostScript output, cursor screen input
Line 6: Defines the Cp axis annotations
Line 7: x-offset and scale for airfoil on Cp vs x plot, BL u profile scale
Line 8: CL axis annotations on polar plot
Line 9: CD axis annotations on polar plot
Line 10: alpha axis annotations on polar plot
Line 11: CM axis annotations on polar plot
Line 12: Mach-CL dependence type, Mach number, solution acceleration parameter
Line 13: Re-CL dependence type, Reynolds number, transition parameter
Line 14: Forced transition x/c locations on top,bottom sides
This file will be read at any time with the RDEF command, thus avoiding the manual entry of all the information.