How TO WRITE UDF FOR PULSATILE PRESSURE GRADIENT?

- August 31, 2018 at 5:57 pm
  
  DEBA
  Subscriber
  
  HELLO SIR HOW TO WRITE UDF FOR FOLLOWING PR. GRADIENT PLEASE HELP ME
  
  I HAVE ATTACHED ONE IMAGE FILE
- August 31, 2018 at 8:16 pm
  
  mli
  Ansys Employee
  
  We have UDF training material and tutorials to help you get started. Let us know if you do not have access.
- September 1, 2018 at 1:30 am
  
  DEBA
  Subscriber
  
  No sir I have not that material.Please sir help me writing this equation . Please also provide this material.
- September 2, 2018 at 1:36 am
  
  raul.raghav
  Subscriber
  
  Refer to the following example from the Fluent UDF Manual. See attached screenshot of the Ansys Help Viewer:
  
  Raef also has a video on pressure inlet condition using a UDF:
  
  CFD ANSYS Tutorial – Variable Transient Inlet Boundary condition using a UDF | FLUENT
- September 2, 2018 at 6:33 am
  
  DrAmine
  Ansys Employee
  
  Removing the links to sharcnet. Please refer to the ANSYS online help which is accessible for students.
- September 2, 2018 at 5:25 pm
  
  DEBA
  Subscriber
  
  ANY ONE PLEASE SIR HELP . THIS IS URGENT SIR
- September 2, 2018 at 5:26 pm
  
  DEBA
  Subscriber
  
  THIS IS KNOWN TO ME BUT IS THER ANY METHOD FOR DEFINING PRESSURE GRADIENT
- September 3, 2018 at 9:31 am
  
  Rob
  Ansys Employee
  
  As has been posted in response to other questions, the UDF manual is a good starting point, and from there you will need a DEFINE_PROFILE to set the pressure. You are also not defining a pressure gradient, Fluent will calculate that, you need to define the inlet pressure, and possibly the outlet depending on what you're modelling. Given blood is incompressible, I'd consider using a velocity boundary, again referring to the UDF manual and DEFINE_PROFILE example.
- September 4, 2018 at 8:00 am
  
  DEBA
  Subscriber
  
  SIR I HAVE WRITTEN ONE UDF CODE BUT GETTING ERROR
  
  ERROR IS fluent/14.0.0/src/dual_cell.h:line 1 : parse error.
  
  I WILL ATTACH MY UDF FILE
- September 4, 2018 at 8:54 am
  
  DrAmine
  Ansys Employee
  
  You need definitely to attend a basic C workshop and UDF training. "mu" is not defined and there is line missing ";". That was exception looking into your UDF.

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