All Does anyone know how to plot both solid temperature (iso surface plot) and fluids velocity vector plot (cut plane) in Flow3d 3D post processing domain?

Not sure about your question. Do you need both fields in one 3D plot?

If not, for solid temperature, you may choose "Complement of Volume fraction" as iso-surface and have "Wall temperature" as the contour variable. For velocity vector plot at some cut plane, if the cut plane is not aligned with X-Y/Y-Z/X-Z plane, you may have to use some 3rd-party software like Tecplot etc.

Hi HC yes i'm referred to both results plot into single 3D plot. so is there a way to do it? i don't have third party post-processing software as you mentioned.