toolParameters Element

Parameters for VSAero tool control

Namespace: Empty

Schema: Empty

Type
Parents
Children
NameOccurrencesDescription
All All
      Element archiveMode

Archive mode for results. 0=nothing, 1=inputfiles, 2=all

      Element panelings

Options and parameters for the mesh generation within VSAero

      Element streamlines[0, 1]

Generation of on-body streamlines. Required for viscous computation. Options: none: no streamlines (default); auto: automatic streamline generation

      Element trefftzComputation[0, 1]

Selection, which of the total coefficients shall be taken from Trefftz-plane computation instead of the normal coefficients from pressure integration. Taking cfx from the Trefftz-plane in case of a viscous computation will still result in pure induced drag, but from the last viscous/potential flow iteration. Possible contents are: none: no values from Trefftz-computation (default), cfx: cfx-values from Trefftz-computation, cfz: cfz-values from Trefftz-computation, cfxcfz: cfx and cfz values from Trefftz-computation

      Element viscousComputation[0, 1]

visciousComputationType

Attributes
NameTypeRequiredDescription
Attribute externalDataDirectorySimple Type string
Attribute externalDataNodePathSimple Type string
Attribute externalFileNameSimple Type string
Remarks

0. General overview

Parameters and options for running the VSAero tool.

1. <archiveMode> (mandatory)

This parameter specifies the amount of additional data, stored as result besides the resulting CPACS dataset. There are three options available:

  • 0: Only the logfile is stored
  • 1: Logfile and all the VSAero inputfiles are stored
  • 2: Logfile, all VSAero inputfiles and the complete output from each VSAero run is stored. WARNING: Selecting this mode incombination with performance map calculations can rapidly produce Gigabytes of data !!!

2. <panelings> (mandatory)

This node contains parameters and options for the surface mesh generation within VSAero.

3. <streamlines> (optional)

Generation of on-body streamlines. These streamlines are required for comutations including viscous drag. There are two options available:

  • none: No on-body streamlines are generated (default)
  • auto: Automatic generation of on-body streamlines

4. <viscousComputation> (optional)

This node switches on and off the viscous computation mode. If this node is missing completely, or if its subnode <iterations> is set to 0, the viscous computation mode is switched off. If <iterations> is > 0, viscous computations are performed (using the specified number of viscous - potential flow iterations). This feature requires the generation of on-body streamlines to be switched on as well. Furthermore, if the drag coefficients shall include viscous drag, CFX must not be taken from the Trefftz-plane (see below).

5. <trefftzComputation> (optional)

By default, the total coefficients are calculated by surface pressure integration. Using this option, CFX and CFZ can be calculated in the Trefftz-plane alternatively. This option typically provides results with better accuracy. Even when using this option, he local coefficient distributions are still based on the surface pressure integration. This results in some inconsistency, as the total values do no longer equal the sum of the local coefficients. If <viscousComputation> mode is used and CFX is taken from the Trefftz-plane, it incorporates the pure induced drag only. There are three options available:

  • none: No values are taken from Trefftz-computation (default)
  • cfx: CFX values are taken from Trefftz-computation
  • cfz: CFZ values are taken from Trefftz-computation
  • cfxcfz: CFX- and CFZ values are taken from Trefftz-computation

See Also