This paper considers the dynamic stability of plane transverse oscillations of two cantilevered pipes interconnected along their outer radii and conveying different fluids with different flow speeds. Stability curves depicting the relation between the two flow speeds at the stability boundary are shown for a number of fluid-structure mass ratios. One fluid flow may dissipate energy delivered to the system by the other, if the speed of the first one is not too large. One pipe can thus be thought ofas a stabilizer to the other, with the aim of increasing the critical speed of the primary flow. The stabilizing effect of one fluid on the other is clarified through considerations of an energy equation together with flutter oscillation shapes. Theenergy equation is also used to derive a relation between the two flow speeds and the phase speed of the flow-induced travelling bending wave.
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