Creation of Fluid Domain

mehduri

hi, i need a help for two quaries . i am trying to simulate 2-d flow around an aerfoil.i have created 2-d geometry of aerofoil and flow domaina (box). i do not know how to make faces in this case .( in case of internal flow such as flow in bending elbow , faces are created from real object). i just want to know whether for this case(flow around aerofoil) faces are created by considering flow domain (box )and aerofoil as real geometry or some other procedure is followed . second i have not been able to find information regarding the exact dimension of this flow domian. i request if some body can help me thanks