Plzzz help I am new and want to specify a particular wall which is inside the domain as two sided meaning the fluid being on both sides of the wall

workng in fluent 6.2.16 plz help thnx n advance

You just need to set the boundary condition to wall in Gambit then in Fluent when setting Boundary Conditions go to the wall menu and you should find 'coupled' as an option. If you select this it will make the wall 2 sided and apply same conditions to both. I have done a similar thing. When you select coupled you do not need to explicitly enter in any more infor although you could define a wall thinckness and change material type to suit your needs. You don't have to enter anything for heat generation option