[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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