FSI – Problem importing pressures from Fluent to Static Structural

- March 28, 2023 at 2:01 pm
  
  pv00170
  Subscriber
  
  Hi,
  When I export CFD pressures from Fluent to Static Structural or Transient Structural only static pressures are imported (therefore no dynamic ones).
  What can I do to import total pressures (dynamic and static).
  In the first picture there's the imported pressures in Static Structural (which correspond to the static pressures obtained in fluent) whereas in the second, the total pressures obtained in CFD.
- March 30, 2023 at 9:52 am
  
  Rahul Mule
  Ansys Employee
  
  Hi,
  Could you please share the procedure of exporting the pressure from Fluent to Mechanical?
  Is this a 1-way FSI problem?
  - March 30, 2023 at 11:44 am
    
    pv00170
    Subscriber
    
    Yes, it is a 1-way FSI problem.
    The Fluent model is a 2D, 2-pressition, SSTKW, VOF (multiphase).
    As pressures are not properly imported directly from Fluent to Static structural, first I have to save Fluent as .cas.gz and then import it in a different standalone. (See image).
    In Static Structural > Improted Load > Insert > Pressure I import the pressures from Fluent to Static structural. (In the image only pressures on the 4th girder of a bridge have been imported).
    The problem is that only static pressures are imported, ignoring dynamic.
    PS: Solution Data and Data File Quantities from Fluent has been left as Default. Still, I don't think is because of that as total pressures are kept inside the Fluent standalone.
- March 30, 2023 at 1:27 pm
  
  Rahul Mule
  Ansys Employee
  
  Hi
  Yes, load transfer for multiphase case from fluent to Mechanical is not supported with HDF5 file format(.cas.h5), for that you have to save files in legacy file format (.cas/.cas.gz). This can be done with following TUI command: /file/cff-files? no
  Refer Using Imported Loads for One-Way FSI (ansys.com) for more information.
  - March 30, 2023 at 1:57 pm
    
    pv00170
    Subscriber
    
    Yes, thats why I use (.cas/.cas.gz) format.
    I have never used TUI commands
    I cannot acces the link as I have problems entering ansys.help
- March 30, 2023 at 1:59 pm
  
  Rahul Mule
  Ansys Employee
  
  Just type that command in console.
  If you are unable to access the link, follow this Forum discussion /forum/forums/topic/using-help-with-links/#latest
  - March 30, 2023 at 2:52 pm
    
    pv00170
    Subscriber
    
    I have red the post that you sent, and actually are the steps that I used.
    Still only static pressures are tranferes, but not dynamic (and therefore total pressures).
- March 30, 2023 at 5:22 pm
  
  Rahul Mule
  Ansys Employee
  
  Yes, Only static pressure is imported and dynamic pressure is ignored. It is known issue.
  - March 30, 2023 at 8:51 pm
    
    pv00170
    Subscriber
    
    If I use Mechanical base interpolation I get an error when importing presures whereas if I use CFD interpolation it works well.
    Is there any way to import dynamic pressures too?