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We report on our attempts to achieve a nearly steady-state gas flow inhydrodynamical simulations of doubly barred galaxies. After exploring theparameter space, we construct two models, for which we evaluate the photometricand the kinematic integrals, present in the Tremaine-Weinberg method, in searchof observational signatures of two rotating patterns. We show that suchsignatures are often present, but a direct fit to data points is likely toreturn incorrect pattern speeds. However, for a particular distribution of thetracer, presented here, the values of the pattern speeds can be retrievedreliably even with the direct fit.

Tremaine-Weinberg integrals for gas flows in double bars