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Recent simulations show that the eccentricity of supermassive binary blackhole with intermediate mass ratio could grow toward near unity throughgravitational interaction with the stellar background in the merging remnantafter two galaxies merge. The increased eccentricity reduces the timescale ofthe supermassive binary black hole merger through the strong gravitationalradiation at periastron. Usually, large amount of gas flows toward the centerof the newly merged galaxy, forming circumbinary gaseous disk around the binaryin the center of the newly merged galaxy. Tidal interaction between sucheccentric binary with intermediate mass ratio and circumbinary disk need to beinvestigated quantitatively. In this work, we study the gravitationalinteraction of the eccentric supermassive binary black hole with intermediatemass ratio and the circumbinary disk using code FARGO3D. Simulations arecarried out with different semimajor, eccentricity and mass ratio. We find thatthe accretion rate onto the inner boundary could be strongly affected by thesecondary black hole and tend to present periodic accretion rate in somesituations. Such periodic accretion rate can be used as electromagneticcounterpart to the gravitational wave radiated by such kind of eccentricbinary.

Interaction of eccentric supermassive binary black hole with intermediate mass ratio and circumbinary accretion disk