ANSYS ACT Dynamic Contact Angle

- April 22, 2020 at 1:43 pm
  
  paulaperelle
  Subscriber
  
  Greatings
  I am a user of Ansys Student 2019 R3.
  
  I followed the installation of Dynamic Contact Angle version 2 for Ansys 2019.
  see link https://catalog.ansys.com/product/5b3bc6857a2f9a5c90d32e20/dynamic-contact-angle
  
  Then i followed the tutorial.
  But, after specifying the model parameters for the analysis in the ACT wizard on Fluent, this message appeared:
  "Error: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).nnLe fichier sp?cifi? est introuvable.
  
  nnC:UsersEdwardDocumentsNon_ConfTest_DCA_ACTTestTuto_filesdp0FLUFluentlibudfwin643d_hostlibudf.dll
  
  Error Object: #f
  
  /define/user-defined/user-defined-memory 14/define/user-defined/function-hooks/adjust "dynamic_contect::libudf"``dynamic_contect::libudf'' unknown -- enter choice again."
  
  And i can't go on with the tutorial.
  
  Can you please advise me some ways to fix this problem?
  
  Thanks in advance
- April 22, 2020 at 3:51 pm
  
  DrAmine
  Ansys Employee
  
  It does not work with 2019Rx releases as highlight in the link you provided.
- April 23, 2020 at 10:05 am
  
  paulaperelle
  Subscriber
  
  Thank you for your reply.
  
  Is it, please, possible to download the prior releases (Ansys Student 2019, 2018, 2018R1, or 2018R2)?
  
  Regards
  
  Ariane
- June 3, 2020 at 8:59 pm
  
  nika2001
  Subscriber
  
  Hi,
  
  While there are a lot of researches on dynamics of wetting and dynamics contact angle, it seems, Ansys fluent update contact angle during simulation. For example if you set static contact angle for a liquid slug in a capillary tube, and then force the slug to move, the contact angle changes.
  
  In this regard, I saw a lot of discussion on how to write a udf to apply dynamic contact angle, when the "wall adhesion" option is activated while I think fluent solver updates the contact angle during simulation and there is no need to do so by a udf.
  
  Actually I'm a kind of confused on this issue and wonder if you can help me?!
  
  Regards,
- June 3, 2020 at 10:26 pm
  
  Karthik Remella
  Administrator
  
  Hello,
  
  What Fluent solver is adjusting is the local curvature one cell away from the wall based on the prescribed contact angle when wall adhesion is activated. The combination of contact angle with the estimated surface normal changes the local curvature. In this case, the contact angle specified should be the equilibrium contact angle.
  
  To read more about this, please refer to the Fluent Theory guide (section 18.3.9.2 - Wall Adhesion). Here is the link: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_th/flu_th_vof_surf_tens.html
  
  If you are looking for a truly dynamic contact angle, you should be relying on a UDF.
  
  If you are looking for instructions on how to open this link, please refer here: /forum/forums/topic/how-to-access-the-ansys-online-help/
  
  I hope this clarifies your question.
  
  Thank you.
  
  Karthik
- June 3, 2020 at 11:50 pm
  
  nika2001
  Subscriber
  
  Hi Karthik,
  
  Thank you so much
  
  As you said the curvature of the interface in the cell next to the wall is adjusted based on the prescribed contact angle and should not change coz the contact angle is constant. But in my case it really changes in this cell during the motion. Maybe I misunderstand sth ?
  
  Regards,