Problem with AcuSolve

User: "Rahul_P1"
Rahul_P1
Altair Employee
Updated by Rahul_P1

Hello,

I want to reproduce the experimental results of a FDA-study (https://fdacfd.nci.nih.gov/interlab_study_1_nozzle/documentation/) with AcuSolve. The experimental assembly consists of a narowing of the cross-section und afterwards a sudden expansion of a channel. The tests run with different flow conditions (Re = 500 till Re = 6500 in the narrowing). If the Re is greater or equal 2000, it is getting intresting. To gain experience with AcuSolve I want to simulate the “easy” laminar flow (Re = 500). But there are aleady problems.
I generate 3 meshes with HyperMesh. The first one with about 150000 elements. In the narrowing the axial velocity along the centerline (z-axis) oscillates. After changing the simulation conditions, like the number of time steps, the time increment, the convergence tolerance, the relaxation factor and so on, without an effect on the results. Becuase of that I generate a second mesh with about 300000 elements. The axial velocity along the centerline does not oszillate any more, but it is to low. With a mesh consists of about 900000 elements the axial velocity drops again.

My supervisor, Mike Nicolai, and I have no more ideas. Can someone help me?

4q524-Nozzle_150k_log30.png
qcl5n-Nozzle_350k_log2.png
22lok-Nozzle_900k.png

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    User: "Rahul_P1"
    Rahul_P1
    Altair Employee
    OP
    Updated by Rahul_P1

    Hi Cleansy,

    Firstly let me assure you that this kind of validation can definitely be performed in acusolve,
    Although the link you provided has detailed information, we still need information about your analysis to help you further

    Please provide the inp file, this will tell us about your boundary conditions.
    An image of the geometry or the geometry file itself (please use the secure file dropbox in the signature below)
    The minimum and max stagger iterations specified.

    Please add a note if the geometry is confidential, when you send a file through the secure dropbox I will be the only recipient and we will maintain confidentiality of the model to the best possible extent.

    User: "Rahul_P1"
    Rahul_P1
    Altair Employee
    OP
    Updated by Rahul_P1

    Hello Mr. Ponginan,

    while I check the model again, I found an error. I generated the geometry file with Autodesk Inventor and import it to HyperMesh. At this there was an error, so that the system of units was inconsistent. I corrected this and now the results of the simulations look better. They still do not match with the experimental results, but I have some ideas.

    Thank you all the same.

    Best regards
    Cleansy

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    Updated by Altair Forum User

    Good day Sir,

      
     I am currently discovering problems in the software.  ' AcuRun : *** ERROR : Unable to install smpd service - see the log file'  The above sentence appears , when I was the process through the Launch AcuSolve   But when I work with the other one, I do not find obstacles like above . ( Lenovo pc )
      Sincerely, Alwin

    <?xml version="1.0" encoding="UTF-8"?>smpd service.png

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    Updated by Altair Forum User

    Hi Alwin,

     Please follow the step below and check this:
     

    1.     Go to start and browse for Acusolve command prompt, as shown below: (Right click and run as administrator) 

      

    2.     A new command prompt will open, Please enter your working directory path in it and the command as shown:  acuRun –mp impi –ismpd 

     

    And try running the job.

     

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