The results of three-dimensional numerical simulations of mass transfer in semidetached binaries after mass transfer termination is presented and the structure of residual accretion disk was investigated .
It was shown that after the mass transfer termination the quasi-elliptic accretion disk becomes circular .
It was also shown that the cessation of mass transfer results in changing of the structure of the accretion disk : the second arm of spiral shock is appeared as well as a new dense formation ( blob ) , the latter moving through the disk with variable velocity .
The blob doesn ’ t smear out under the action of dissipation but is sustained by interaction with arms of spiral shock for practically all the lifetime of the disk .

We also analyze the dependence of disk ’ s lifetime on the value of viscosity .
For the value of parameter \alpha that is typical for observing accretion disk ( \alpha \sim 0.01 ) the lifetime of residual disk is found to be equal to 50 orbital periods .