Chapter 3 Shell Meshing – Workshop 2 Wingbody – F6 Model

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Presentation transcript:

Chapter 3 Shell Meshing – Workshop 2 Wingbody – F6 Model ICEM CFD Introductory Course

Create Project / Open Geometry File > New Project Enter the Wingbody folder Type Wingbody-shell_mesh Save File > Geometry > Open Geometry… Select F6_complete.tin Open

Mesh Setup Need to set Mesh Methods, Types and Sizes: First set global settings Mesh > Global Mesh Setup > Global Mesh size Set Max element size to 1000 Maximum allowable mesh size in model Set Max Size by parts as shown in the table below Mesh > Part Mesh Setup

Surface Mesh Parameters Set default Mesh type and Mesh method Mesh > Global Mesh Setup > Shell Mesh Parameters Mesh type: All Tri Mesh Method: Patch Dependent Set Shell Meshing Parameters section to Patch Dependent Set Ignore size = 0.05 Apply Force mapped mesh along wing Select Mesh > Surface Mesh Setup Select 4 leading edge, and 2 thin trailing edge surfaces as shown Change Mesh method to Autoblock Apply NONE means it will use the global setting

Set Curve Parameters Set finer node distribution across leading edge Turn on all Parts Turn on Curves only Turn on Curve Node Spacing (right mouse select Curves) Zoom toward front of WING where it meets the FAIRING Select Mesh > Curve Mesh Setup Change Method to Dynamic Select Number of nodes Position cursor on node number next to curve shown Increment number of nodes with left mouse key to 11 (right = decrement) Change Bunching law to Geometric 1 Select Bunching ratio and position cursor near the same curve Note the arrow which defines direction from end spacing 1 to end spacing 2 We want to bias towards 2 (direction of arrow) Right mouse select until Geometric 2 appears Increment with left mouse (over number) to 1.2

Set Curve Parameters Copy same distribution to opposing “parallel” edges Still under Curve Mesh Setup, change Method to Copy Parameters From Curve select same curve we just edited To Selected Curve(s), select 5 curves shown across leading edge Middle mouse, then Apply Some curves have a reversed direction than the one we copied from In this case two bottom end curves as shown Go back to Dynamic method Reverse (right mouse on curve) or decrease Bunching ratio number to 1.0 Bunching law changes to Geometric 1, when the ratio reaches 1 Left mouse key to increase to 1.2

Node spacing turned off for clarity Set Curve Parameters Make number of nodes equal across parallel curves Still in Dynamic method select Number of nodes and change curve towards middle bottom of wing as shown to 6 (right mouse to decrease) Node spacing turned off for clarity This will give 32 + 6 -1 (shared node) = 37 nodes Same as parallel ones Better ensuring a mapped mesh Also increase number of nodes along wing tip to more closely match those along leading edge Refine node distribution near the fuselage nose Change Curve Mesh Setup Method to General Select front most curves along fuselage shown Middle mouse to accept selection Change Maximum size to 5 Apply

Create Surface Mesh Mesh > Compute Mesh > Surface Mesh Only Select Geometry > All Compute Note bad quality surface mesh in front of fuselage Turn off FARFIELD part

Delete Mesh Delete bad mesh Turn off FARFIELD, INLET, OUTLET To be able to select mesh behind them Select Edit Mesh > Delete Elements and select one of the elements on each surface as shown Select… up to a curve in Select mesh elements toolbar or “r” on the keyboard to flood-fill all other elements on those two surfaces Flood fills to boundary curves making up loop Middle mouse or Apply

Re Mesh Two Surfaces Remesh fuselage surfaces Go back to Mesh > Global Mesh Setup > Shell Meshing Parameters Turn on General > Respect Line Elements To ensure new mesh is conformal with mesh on adjacent surfaces Change Repair > Try harder level to 3 Runs robust octree (patch independent) method Further down menu Apply Select Mesh Compute Mesh > Surface Mesh Only Change Input to From Screen Select geometry, then the two surfaces, then middle mouse Make sure to have surfaces turned on in Model tree Compute

Final Mesh Save Project! Observe revised surface mesh Note mapped (aligned) mesh along leading edge (front of wing) Save Project!