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2D and axisymmetric capabilities

The de­fault of this solver is 3D. But an op­tion for 2D prob­lem cal­cu­la­tions is al­so pro­vid­ed. If the user wants to use this 2D solver, they must have a mesh that has on­ly a sin­gle lay­er of el­e­ments in the z-di­rec­tion (i.e., a 2D x-y mesh (quadri­lat­er­al or tri­an­gu­lar mesh) but ex­tend­ed in the z-di­rec­tion). Al­so, the user should not de­fine the bound­ary con­di­tions on the z-di­rec­tion bound­ary sur­faces (both sides). Then the code will au­to­mat­i­cal­ly check for this set­up, and use the 2D solver if a 2D mesh was de­tect­ed. This saves a lot of CPU time for some prob­lems.

A 2D ax­isym­met­ric flow op­tion is al­so avail­able with this solver. In or­der to make use of this op­tion, the above 2D re­quire­ments must be sat­is­fied. In ad­di­tion, the x and y co­or­di­nates must cor­re­spond to the ax­i­al and ra­di­al di­rec­tions re­spec­tive­ly. Cur­rent­ly, this op­tion on­ly works on hexa­he­dral mesh­es (quads in 2D case).