  We present synthetic Doppler maps of gaseous flows in semidetached binaries
based on the results of 3D gas dynamical simulations. Using of gas dynamical
calculations alongside with Doppler tomography technique permits to identify
main features of the flow on the Doppler maps without solution of ill-posed
inverse problem. Comparison of synthetic tomograms with observations makes
possible both to refine the gas dynamical model and to interpret the
observational data.
