  We have developed a new two-dimensional hydrostatically-balanced isobaric
hydrodynamic model for use in simulation of exoplanetary atmospheres. We apply
this model to the infrared photosphere of the hot Jupiter HD 189733 b, for
which an excellent 8-micron light curve has been obtained. For reasonable
parameter choices, the results of our model are consistent with these
observations. In our simulations, strongly turbulent supersonic flow develops,
with wind speeds of approximately 5 km/s. This flow geometry causes chaotic
variation of the temperature distribution, leading to observable variations in
the light curve from one orbit to the next.
