I am trying to mesh a furnace having external dimensions of 2.7 m radius and internal radius of 1.3 m, I have already developed a tetrahedral mesh without much problem but i want to c if hexa dominant mesh will give better results as this mesh is more physics dependent and more flow oriented.
As you can c over here there are cone shaped burners all over the exterior face of the furnace. Each burners has 9 inlet tubes which carry fuel into the furnace for combustion to happen etc. its dia is around 9.5 mm. When i use hexa dominant mesh externally everything seems ok but internally below shown problems occur as shown in fig a and b. All the details of sizing and face mapping used has been shown in figure d.
c) burner details
e) edge sizing for inlet tubes has been given as shown below
g) over all mesh looks good but internal problem exists
h) edge sizing done here as well
any advice in making the mesh further good using hexa-dominant mesh how to get rid of this internal issues ?