Betts 10 47

[Peter230655]

This may be a candidate for examples-gallery for these reasons:

• It is a three stage problem, where the results of the previous stage are the initial conditions for the next one. There is no example like this in examples-gallery, to my knowledge.
• The second stage is a singular arc (see section 4.16.1 for some explanation). I do not think, opty allows to incorporate the additional boundary condition needed, so I just ignorted it. As per John Betts ignoring it may make the result less reliable.
• In the first stage opty does not converge, no matter what I tried. Yet the results are good. So, maybe one should not immediately discard a result of opty simply because opty says it did not converge.
• The results given in the book differ from the results John Betts sent to me by email, by 0.5..0.6 %. So, it seems to me the difference between opty and Betts' results are acceptable.

[Peter230655]

I made some mistake with git!

[Peter230655]

Just for information: These are the result John Betts sent me by email.
cdsosn_gdrd07.out.zip
cdsosn_gdrd07_barrier.zip