Flaps and Slats

[B-ROB]

Can OpenVSP and AEROVSP model slats and flaps?

[Brent Robbins]

Rephrase: Can OpenVSP and AEROVSP model SLOTTED slats and flaps?

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On Sat, Jan 28, 2017 at 8:21 PM, 'B-ROB' via OpenVSP

<ope...@googlegroups.com> wrote:

Can OpenVSP and AEROVSP model slats and flaps?

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[Rob McDonald]

Erik Olson has done some work looking at high lift configurations with
VSPAERO and other related tools.

In general, you'd be surprised how well it can do at predicting the
shift in the lift curve -- however, don't expect it do do anything for
predicting stall, post-stall, or CLmax.

You'll want to build your own confidence up by starting with simple
examples with published data. Once you get the hang of that, you
should be able to get some idea of lift distribution and lift curve
slope change for a realistic 3D wing.

Rob

On Sat, Jan 28, 2017 at 10:34 PM, 'Brent Robbins' via OpenVSP
<ope...@googlegroups.com> wrote:
> Rephrase: Can OpenVSP and AEROVSP model SLOTTED slats and flaps?
>
> Sent from Yahoo Mail on Android
>
> On Sat, Jan 28, 2017 at 8:21 PM, 'B-ROB' via OpenVSP
> <ope...@googlegroups.com> wrote:
> Can OpenVSP and AEROVSP model slats and flaps?
>
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[Erik Olson]

Brent,

VSPAero's analysis of the lift differential due to flaps will tend to be optimistic because it's not able to capture some of the boundary-layer effects (these exist at low angles of attack and are separate from stall). See the attached paper for analysis results I obtained using AVL; the results from the vortex-lattice method in VSPAero should be similar and can probably be corrected by the same amount.

[Fahad Maqbool]

Hello Erik D. Olson.

I came to know about the external utility to convert the HRM file to AVL file while reading http://openvsp.org/wiki/lib/exe/fetch.php?media=workshopv3:openvsp_with_avl_olson.pdf
I also need the exactly same utility, can it be provided?

Thanks.

[Olson, Erik D. (LARC-E403)]

I’m currently putting a library of methods through NASA’s software release process and hope to have them available in the Spring. The updated version of the methodology creates an AVL file using the Degenerate Plate exported from OpenVSP.

 

Erik

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[Fahad Maqbool]

That's nice. Do you have anything for the time being that you can share for hrm2avl conversion. Anything at the moment that can help to ease the process somewhat. 

It would be very nice. 

[Rob McDonald]

We've done one (that we can't release yet) based on accessing the DegenGeom information directly through the API in Python.  The latest release (I think, maybe earlier) exposes all the DegenGeom data to the API in-memory -- so you never have to parse any files.

Consequently, it is really easy to start from that and dump out an AVL file (or anything else similarly minded).  You could do it in *.vspscript too.

Rob

[Fahad Maqbool]

Hy Rob, that helped me extracting some information required for AVL from DegenGeom such as leading edges and chord etc., but i am unable to find the Sref (wing reference area), Cref (Mean chord length) and Bref (Wing span). can you point it where are these variables in DegenGeom file.  

[Rob McDonald]

I don't think it is in the DegenGeom file directly.

You can pull typical reference parameters from the wing Parms.

Rob