Ansys Employee



A good way to think about the blocking is that the structure you intend to create is aimed at getting the grid lines to flow in the directions you want along the geometry and in the farfield with good element angles. The rest should be done by controlling the number of nodes along edges and growth from either end of each edge using the “Edge params.” Your blocking is a good structure because it causes grid lines to flow nicely along the geometry and continuing into the farfield, and the block edges meet the geometry at good angles, in your case close to normal to the blade.
In the second blocking example, this may show a blocking that is easier to get smooth growth ratios on edges between blocks but the edges do not meet the blade at such a good angle. Your picture is zoomed far out and does not show this problem.

With this blocking you could shape the edges using “Blocking > Edit Edge > Split Edge” as below to get better angles:

Either way you must use the “edge params” to set good growth ratios and node counts, so that is the real issue. All edges are candidates for this manipulation except you shouldn’t need to worry about growth ratios on the edges that run along the blade span. These can be uniform.

The “Blocking > Pre-Mesh Params > Match Edges” can be used to quickly match the spacings across blocks:

But you’ll still want to select edge and control growth ratios on side 1 and side 2. You will especially need to control the growth ratios on the edges shown below in your model, but all edges should be carefully set to get smooth mesh size change between blocks:

This fine tuning of node growth is done mostly with the “Blocking > Pre-Mesh Params > Edge Params.” You’ll want to set spacing 1 and 2 on side 1 and 2 of the edge as well as ratio 1 and 2. You can choose different growth laws also, such as bigeometric, biexponential, hyperbolic, etc…