ESDU VGK

version: v=1.0.241220

VGK Status: Not run yet...

VGK Status: Running...

VGK Status: Run completed successfully. See 'Results' and 'Pressure Coefficient Graph' tabs for details.

VGK Status: Warning - the input has changed since the last run! Rerun the calculation...

VGK Status: Run contain errors or warnings. See 'Results' tab for details...

Configure VGK

Getting started:

Begin by selecting your analysis type, or by loading an example from the 'ESDU Examples' dropdown menu above.

See the 'Help' tab for detailed guidance.

Viscous calculation

For a viscous calculation specify either the angle of incidence or the lift-coefficient of the aerofoil.

Cases Table

Case	Mach number $M$	Angle of incidence $\alpha$
{{$index+1}}

Cases Table

If you specify the lift coefficient then

you can only run one Case.
you will also need to supply an initial estimate of the angle of incidence to be used in the calculation. VGK will calculate the actual angle of incidence and present the result on the 'Results' tab.

Case	Mach number $M$	Initial estimate of the angle of incidence $\alpha$	{{tba.vgk.ep.i.flowsolveroptions.viscous.CL.title}}
1

Additional required parameters

Inviscid calculation

Cases Table

Case	Mach number $M$	Angle of incidence $\alpha$
{{$index+1}}

Notes:

VGK parameters (advanced):

Some of the internal VGK parameters can be modified if required. However, you are strongly advised to use the ESDU defaults. See Transonics, Section 6b for more information on the usage and setup of VGK.

For a viscous calculation these additional parameters can be specified

Aerofoil selection and details

Partial results are displayed below.

Viscous calculation results

Warning - the input has changed since this Results Table was produced

Results Table

Save results as

Case

Shocks

{{occ.oodleCore.utils.valPrintFormatted(ccase.M.value, 'f', '3', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.alpha.value, 'f', '3', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CL.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CM.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CDP.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CDF.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CDT.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CDV.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.CDW.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.RThetaTransitionUpper.value, 'p', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.viscous.RThetaTransitionLower.value, 'p', '5', 'n/a')}}

Yes

Shocks for case #{{$index+1}}:

Upper surface:		{{occ.utils.valPrintFormatted(crow.row[0], 'f', 5, "not valid")}}
Upper surface:		{{occ.utils.valPrintFormatted(crow.row[1], 'f', 5, "not valid")}}

Lower surface:		{{occ.utils.valPrintFormatted(crow.row[0], 'f', 5, "not valid")}}
Lower surface:		{{occ.utils.valPrintFormatted(crow.row[1], 'f', 5, "not valid")}}

Key

Inviscid calculation results

Warning - the input has changed since this Results Table was produced

Results Table

Save results as

Case

Shocks

{{occ.oodleCore.utils.valPrintFormatted(ccase.M.value, 'f', '3', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.alpha.value, 'f', '3', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.inviscid.CL.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.inviscid.CM.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.inviscid.CDP.value, 'f', '5', 'n/a')}}

{{occ.oodleCore.utils.valPrintFormatted(ccase.inviscid.CDW.value, 'f', '5', 'n/a')}}

Yes

Shocks for case #{{$index+1}}:

Upper surface:		{{occ.utils.valPrintFormatted(crow.row[0], 'f', 5, "not valid")}}
Upper surface:		{{occ.utils.valPrintFormatted(crow.row[1], 'f', 5, "not valid")}}

Lower surface:		{{occ.utils.valPrintFormatted(crow.row[0], 'f', 5, "not valid")}}
Lower surface:		{{occ.utils.valPrintFormatted(crow.row[1], 'f', 5, "not valid")}}

Key

Graph your results

Warning - the input has changed since this graph was drawn

Plot: y vs x

Unable to display pressure coefficient graph - all Cases failed

Viscous Results Graphs

Additional Graphs

Unable to display viscous results graphs - all Cases failed

Inviscid Results Graphs

Unable to inviscid results graphs - all Cases failed

Mapping Data and Graphs

VGK Files

It may be helpful to some users to have access to the 'raw' files as used by the VGK executable program that runs within this ESDU VGK interface. These files are listed below. They contain the VGK data from the last run.

VGK full results (.FUL) file

Contains the full results of the last VGK run. May be of use to an advanced user.

VGK PLOT.DAT file

Contains a summary of the complete VGK run. Used internally within ESDU VGK.

VGK controller (.VIN) file

Flow condition input file for the command line version of VGK. See ESDU 96029 for details.

VGK Aerofoil (.DAT) file

Aerofoil coordinates data file. See Section 5 of ESDU 96029 for details.

VGK inviscid element run convergence history (.IEH) file

The IEH file contains the 'inviscid-element history', ie for each iteration of the inviscid flow element, it gives the values of RES (the maximum residual in inviscid flow element) and CLPOT (the value of $C_L$ determined from jump in potential at trailing-edge). It is used to judge whether or not a VGK run is sufficiently converged. See ESDU 96029 for details.

VGK viscous run convergence history (.VEH) file

For any viscous run the VEH file contains the 'viscous-element history', ie for each iteration of the viscous flow element it gives the value of VRES (the residual corresponding to the trailing-edge location in the viscous flow element). Together with the IEH file it is used to judge whether or not a VGK run has sufficiently converged. See ESDU 96029 for details.

For full instructions on the use and applicability of this ESDU VGK Toolbox app please refer to the User Guide (opens in a new tab/window).

What is VGK?

VGK is a CFD (computational fluid dynamics) method for predicting the aerodynamic characteristics of a two-dimensional single-element aerofoils in a subsonic and high-transonic freestream, including the effects of viscosity (boundary layers and wake) and shock waves. VGK uses an iterative approach to solve coupled finite-difference equations for the inviscid flow region (assumed to be potential) and the viscous flow region represented by integral boundary-layer equations.

Privacy statement

Note that any data you supply to us are never looked at or retained by ESDU. We use your input data to run your requested calculation and, once the results are returned to you, we immediately delete any and all data for that program run.

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tba:

{{tba | json}}

tba:

{{tba.vgk.ep | json}}

Welcome to ESDU VGK

Viscous Garabedian Korn method for two-dimensional aerofoil sections

Loading...

Configure VGK

Getting started:

Viscous calculation

Cases Table

Cases Table

Additional required parameters

Inviscid calculation

Cases Table

VGK parameters (advanced):

Aerofoil selection and details

Viscous calculation results

Results Table

Key

Inviscid calculation results

Results Table

Key

Graph your results

Viscous Results Graphs

Additional Graphs

Inviscid Results Graphs

Mapping Data and Graphs

VGK Files

VGK full results (.FUL) file

Contains the full results of the last VGK run. May be of use to an advanced user.

VGK PLOT.DAT file

Contains a summary of the complete VGK run. Used internally within ESDU VGK.

VGK controller (.VIN) file

Flow condition input file for the command line version of VGK. See ESDU 96029 for details.

VGK Aerofoil (.DAT) file

Aerofoil coordinates data file. See Section 5 of ESDU 96029 for details.

VGK inviscid element run convergence history (.IEH) file

VGK viscous run convergence history (.VEH) file

For full instructions on the use and applicability of this ESDU VGK Toolbox app please refer to the User Guide (opens in a new tab/window).

What is VGK?

See also...

Privacy statement

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