The structure of the flowfield in the vicinity of the trailing edge of
a flat plate at zero incidence in mixed transonic flow has been studi
ed using viscous-inviscid interaction methods. The resulting nonlinear
partial differential equations governing the flow were solved numeric
ally using finite-difference methods for a range of values of a transo
nic similarity parameter which occurs in the mathematical formulation
of the problem. Of special interest is the formula for the total drag
coefficient of the plate as a function of the similarity parameter. Va
lues of the similarity parameter have been chosen to ensure that subcr
itical, supercritical and mixed flow regimes are all considered.