Learning Forum

[Elyite]

I do not know if this is in the correct section, but...

I am trying to run a problem on a problem on a cd nozzle and i get an error.

 

Error #001100279 has occurred in subroutine ErrAction. Message: Could not invert control surface Ap.

Error #001100279 has occurred in subroutine ErrAction. Message: Stopped in routine ASS_GLOBCS_IAP

 

I have two domains, one for the nozzle and the other for the exhaust. It is 8 degrees axis symmetric. I only started getting this error when i switch to an inviscid ideal gas air (just changing the dynamic viscosity to zero from the one provided).

Boundaries:

Default Domain- ref pressure 1atm, continuous fluid, total energy and no turbulence (laminar)

Inlet- subsonic with total pressure and temperature

Outlet- supersonic

Opening - subsonic with relative pressure of 0 and Temp 298K

Wall- free slip, adiabatic   [There is a wall for the nozzle domain and the exhaust domain]

Symmetry

Fluid Interface- fluid fluid

I don't know if this helps but if Ideal gas air is used, this error does not occur. However, I need to run it with inviscid air.

 

[Rob]

Have a look at (and post in with the text) the results for the working model. Velocity & pressure ought to do it.

[Elyite]

 

Thanks for taking the time to do this. Will this work or could you be more a little more specific please. This results used a no slip condition for the wall along with ideal gas air as the fluid. With the calculations and nozzle design used it should hit a mach of just above 2. However with the supersonic outlet condition the mach goes up to 3 or so at the end. Changing it to open fixed that. When I run the sim with ideal gas air and free slip, the solution is just slightly expanded and a few mach diamonds can be seen to kind of form. 

Could you explain what the errors mentioned above mean? I asked my professor and a couple graduate students at my Uni and they have never seen it before. Thanks again!