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Marquee

Problem Background

This just scrolls a black and white image across the screen from right to left like a marquee by creating density contrasts. The image is stored in the message.dat file. The file used says AstroBEAR !!! with bearclaws on either side. To produce the image, gimp was used to create a black and white image - which was imported into matlab - and exported as ascii text with 0 being background and 1 being foreground.

Reason for Test

It tests the ability of the code to resolve contact discontinuities - and makes for fun movies.

Results

Original Test

The new chombo can be verified by looking at the magnitude of the density.

Test	Reference Chombo	New Chombo
Original	TestRef(Marquee, 500px)	TestSim(Marquee, 500px)

TestLog(Marquee)