How can the mesh quality be improved where several blocks meet?
Create a 3D curve or two and attach the interior edges to these curves appropriately. Also use transfinite interpolation (tfi) which then spreads the perturbation smoothly across two regions. There might be many places that you can use this technique. There are no rules to follow here. You have to inspect the region with the greatest distortion. Then determine how to change in one or more of its boundary edges to improve it without cause serious degrading of the neighboring regions.
In regions where the aspect ratio is bad, use res or one of the other nodal distribution commands, sometimes in subtle ways, along one edge to improve the aspect ration in one area at the expense of a poorer aspect ration or element quality in the neighboring regions.
Usually this requires experimentation.
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www.truegrid.com/FAQ/improve_quality.html April. 4, 2008