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How do I avoid strange streaky artifacts like these on the concave part of the object?

Tried to remove doubles and beveling with no effect

enter image description here

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Avoid using n-gons (polygons with more than 4 vertices) those will not subdivide nicely..

enter image description here

Get rid of it (and the one on the other side of the object)

Add one more loop cut (so that you have an even number of vertices in the edge loop)

Select the edge ring, use Grid fill and set the span to something that makes sense.

Grid fill will create proper topology based on quads.

Repeat grid fill on the other side of the object.

enter image description here

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  • $\begingroup$ Wow! That's It! Thanks for this thorough explanation. Kindly and with much appreciation, Mikael $\endgroup$
    – Mikael
    Feb 22, 2018 at 4:58

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