Have jagged contours on your surface? Here are a couple options to smooth them out. Find out which works best for you.
Contour polygons D3 by Observable
Surface, Civil 3D Plus
How To: Smooth Contour Lines in ArcGIS Pro
Why are my Contours not matching contours created - Esri Community
Survey Civil 3D Plus
Civil 3D - Smooth Out Those Contours!
Tip #114: Creating Contour Lines Over a Surface
Infrastructure Tuesday: Smoothing Contour Lines in Civil 3D
How To: Smooth Contour Lines in ArcGIS Pro
BREAKLINES: WHAT ARE THEY AND WHY ARE THEY IMPORTANT IN SURFACE
displays the plots of the temperature distribution contour for the
Methods to Smooth Surfaces
contours Civil 3D Plus