How to mesh sandwich 3D structures

Hello All,

I have some difficulties to mesh the 3D sandwich composite. I want to mesh the outer volume with composite materials  with 15 plies and the inner with foam. I don't know how to do so. I've tried to do mesh the outer volume by SOLID46. But I didn't get good mesh due to element coordinate mismatch. Could anybody please suggest me in this regard? I really need your help.

Thank you very much.

 Wasim