[FLASH-BUGS] assymetrie in hydro flash 2.1?

[Markus Gross]

Hi!

I have a hydro run in 3d carthesian coordinates, symmetric about the z axis. 
I note that after just six timesteps that though I have perfect symmetry with 
respect to the x-z and y-z planes the rotational symmetry is gone from one 
timestep to the other.
There artefacts are in the order of about 100 Pa where the pressure in the 
problem ranges from 800000 Pa - 2000000 Pa.
Initially not much but this trend will worsen, especially when the timestep 
picks up ... and I have a highly sensitive BC at the other end which will 
blow up quite quickly even at such small differences - but the flow is not 
anywhere close to that in the first six steps (takes about 70 timesteps to 
reach it).

Does such a problem ring a bell with someone, i.e. an allready fixed bug? I 
will try tomorrow to make a setup for flash2.3, but it may be tricky to 
reproduce exactly the same case. And even more tricky for me to migrate to 
2.3 ...
Can I read restartfiles from 2.1 in 2.3?

Thanks for your time (again)!

Markus.



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Markus Gross AMIMechE BEng (Hons.) Mechanical Engineering

Heriot Watt University Edinburgh
School of Engineering and Physical Sciences
James Nasmyth Building
Edinburgh
EH14 4AS
UK

Member of  IMechE, SPIE, CSME and VDI
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further contact:

Phone   : +44 (0) 131 451 4737

UNiX talk: talk markus at lasersim.mce.hw.ac.uk

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