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I'm looking for an aerodynamic code to model a transonic (say around M=0.8) wing for some basic structural sizing and performance estimation. I'm hoping to use the MATLAB based VLM code Tornado. It has an inbuilt Prandtl-Glauert correction option. I realise that this is technically applicable only below transonic speeds (say M<0.7) but I was wondering if:

- The span loading outputs would be acceptable for some preliminary design studies and spar/cover sizing?
- The drag estimates would be useful in any way?

My initial thoughts are that the span loading could be used for preliminary sizing as although the model will not include the effect of shocks, my thinking is that this will be approximately uniform along the span. Therefore a difference in lift (between the P-G correction and a model including shocks) will be the same along the span and so the loading will be the same. How does that sound?

As far as performance estimate goes... Given my above argument I also believed the induced drag values will be usable. I could then tack on viscous and wave drag data and bob's your mother's brother!

I'd really appreciate any thoughts on my reasoning here, if it's good/bad/needs modification, other points to consider that I've missed or suggested relevant reading (as I'm struggling to find anything specifically on this topic). Thanks for reading!

David

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# Aerospace Use of Vortex Lattice Method in Transonic Applications

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