[CFD++] problems for transient computations
Hi everybody,
I need some advises to compute a flow in a turbine design. What is quite special is that i'm trying to perform an supersonic oscillating flow at the inlet. So we are in unsteady conditions.  Here is the Bc's at the inlet: BC group:inflow/outflow BC subgroupe: special  oscillatory inflow/outflow (prescribed velocity) This is a flow oscillating (sinusoidal) around 1888 m/s, with a frequency of 1s, an amplitude of about 20 m/s.  Concerning the time integration panel: I'm using a restart file (a steady computation for a flow velocity of 1888 m/s), a transient simulation, implicit integration type. The problem is that I get a complete unconverged solution: very important mass flows (like 2 tons/s!!). I have several possible solutions:  too big time step: it seems to be not better  too much unstable flow: that's why i used a small amplitude  better to play with the CFL: in an implicit scheme, does the CFL have an influence? what i don't understand exactly is the process used by CFD++ for an unsteady computation: time and space discretization, what's going on exactly for each time step. Maybe can u help me, or give some advices or ideas to resolve my problem? thank you all! 
hi,i want to know where can i download CFD++ software?thanks

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