mesh around suction hole
hi
I am trying to model suction over an airfoil in fluent and gambit. but i encountered some problems that i can not find the solutions for since 2 weeks ago. first:: i have read many articles that model continous suction or suction using a synthetic jet. all of the articles give us the suction velocity ,but when i choose the outer boundary as pressure far field ,i see some warnings. some body tolds me that i have to use the pressure outlet boundary condition for suction hole... but i can not calculate the pressure for my low renolds number model... in other words when i am trying to re-do an earlier numerical work in fluent that used velocity inlet for suction,i also have tobe able to do it.. 2; the drag coefficient is negative in nearly all cases and the lift coefficient has a big variation with the exact value..and sometimes has a negative value. 3.i have modeled more than 7 different cases in gambit with differen meshes. i do not know where do the problems come from? please answer these questions : a: which type of mesh is better for modelling a base airfoil and suction-including airfoil.. C-H grid....O-grid....boundary layer mesh or .... please send me a dbs file of mesh over a base airfoil and a dbs file of mesh over a sutioned airfoil... b: please tell me which boundary conditions i have touse in gambit... pressure far field,symmetry,wall or ...... for a typical C-H grid over airfoil please express the boundary cond. detailed. c: which solver and discretization schemes is better to model a base airfoil and suctioned airfoil. tell me the appropriate turbulance model and any other things you things is good to better model an airfoil. d: to calculatethe darg and lift coefficients in fluent , is it needed to change the default value of area in refrence value? e:please send me by email useful file(tyrorial,mesh file,dbs file ,case and data file or..) thatcan help me to do this...thanks i am ready to send you my works to tell me my faults.. but it isan emergency ..please sooner... thanks f:: please answer me,,,,,, i'm stock... |
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