Hypermesh cfd help

I am working on reinforced carbon composites and want to study volumetric flow rate at outlet. I am new to hypermesh cfd software and since my structure doesnt have closed contours as shown below, I dont understand how to generate a solid mesh for flow study. Can anyone help me with it . I am using hypermesh cfd 2023 version.

I want to use inlet(o pa)  and outlet (1 pa)  in z - direction faces , symmetry in y -direction faces and wall with no slip boundary conditions for the coloured solid structures.