2D flow calculation around an airfoil
I’ve just started learning Fluent and Gambit for my school project. For our term project we have to compute 2d flow around an airfoil section. However I’m having some difficulties choosing between different ways to mesh the domain. Our teacher wants us to use quadratic (preferably square) grid. I searched for some tutorials and papers and found few ways to arrange mesh. However I could not find a way to make all grid square, because of the shape of the profile most of them used arc for inlet edge, as a result, around the foil, grid becomes rhomboid. Is there anyone who can help me with this? Also what is the disadvantage/advantage of using square or rhomboid grid?

Dear friend,
For meshing, quadratic mesh is best than others but if there are difficult other mesh is OK.. meshing method is mathematics area.. you can find the reason in it.. but for general, great mesh can be seen by its angle.. sharp angle is bad mesh.. hope it helps teguhtf 
area problem
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i want to calculate area of circles which would be used in ansys fluent ....
it is 2d heat exchanger and i have problem how to calculate area of circle in front of flow or which area i have to put in reference value .. i have confusion whether i have to use area of 2 or 4 circles ??? kindly tell me how to calculate this area or which area i have to put in reference value ??? i have attached the jpeg. file of structure to further explain it ? waiting for answer...i will be very thankful to you. what Reference values should I used in fluent to find the area as defaults values are 1 for area,depth and length. Area=? Depth=? 
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