Topics relate to Fluent, CFX, Turbogrid and more

Error in CFX for CD Nozzle Problem

    • 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).


      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]


      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
      Ansys Employee

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

    • Elyite

      This is the velocity streamlines. Ideal gas air was used for fluid and the wall boundary was set to no slip


      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!

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