Another Approach to the Extended Stokes’ Problems for the Oldroyd-B Fluid

Figure 1

The contour path for the case 𝜆_𝑟≥𝜆>0. Single pole 𝑠=0 is for the first problem and two poles 𝑠=𝑖Ω and 𝑠=−𝑖Ω are for the second problem.