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Context: White dwarf - Brown dwarf short period binaries (P$_{\rm orb}$$\lesssim$ 2 hours) are some of the most extreme irradiated atmosphericenvironments known. These systems offer an opportunity to explore theoreticaland modelling efforts of irradiated atmospheres different to typical hotJupiter systems. Aims: We aim to investigate the three dimensional atmosphericstructural and dynamical properties of the Brown dwarf WD0137-349B. Methods: Weuse the three dimensional GCM model Exo-FMS, with a dual-band greyradiative-transfer scheme to model the atmosphere of WD0137-349B. The resultsof the GCM model are post-processed using the three dimensional Monte Carloradiative-transfer model \textsc{cmcrt}. Results: Our results suggestinefficient day-night energy transport and a large day-night temperaturecontrast for WD0137-349B. Multiple flow patterns are present, shifting energyasymmetrically eastward or westward depending on their zonal direction andlatitude. Regions of overturning are produced on the western terminator. We areable to reproduce the start of the system near-IR emission excess at $\gtrsim$1.95 $\mu$m as observed by the GNIRS instrument. Our model over predicts the IRphase curve fluxes by factors of $\approx$1-3, but generally fits the shape ofthe phase curves well. Chemical kinetic modelling using \textsc{vulcan}suggests a highly ionised region at high altitudes can form on the dayside ofthe Brown dwarf. Conclusions: We present a first attempt at simulating theatmosphere of a short period White dwarf - Brown dwarf binary in a 3D setting.Further studies into the radiative and photochemical heating from the UVirradiation is required to more accurately capture the energy balance insidethe Brown dwarf atmosphere. Cloud formation may also play an important role inshaping the emission spectra of the Brown dwarf.

Simplified 3D GCM modelling of the irradiated brown dwarf WD0137-349B