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Rajendra Prasad

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About Rajendra Prasad

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    Beginner

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    India
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  1. ACUSOLVE

    Hello, I am working on automobile component i.e. EGR coolar. Here task is to Cool hot gas emitting out from engine and to send back to engine by using coolar i.e. ethylene glycol. EGR coolar has two fluid gas(hot air) & coolant(Ethylene glycol). Each fluid passing from 1 side. It may be parrallel or counter flow. I am getting inputs from customer like this, I am showing you 2 case as follows: CASE 1: Coolant flowing at 90"C @ 1200l/hr @ 2.5Bar-gauge Exhaust Gas at 450"C @ 150Kg/hr @ 2Bar-gauge CASE 2: Coolant flowing at 90"C @ 1200l/hr @ 2.5Bar-absolute Exhaust Gas at 450"C @ 150Kg/hr @ 2Bar-absolute Hence some time I am getting input value of pressure in bar or absolute. I am giving BC like this: At inlet I am defining pressure and temperature and at outlet negative flow I am giving. But I am not understanding how to value of pressure in gauge and absolute? Regards Rajendra BorgWarner Emissions System
  2. ACUSOLVE

    Hello, How to get gif animation in ACUFIELDVIEW I know how to form video in Acufieldview, but problem is video I am getting is in AVI. format. Then I am converting AVI. format to GIF and then preparing ppt. But while converting it, croping option is not there. Due to which ppt presentation is difficult. Is there, any another way where I get gif directly with crop option and with good clarity. Please help me. Regards Rajendra Borgwarner Emissions System
  3. How to open ".bc_warnings"

    I have open it. It is written that: *** WARNING: Surface 133715 of element BC "Int_BaffleInletSide_CircularTube_Side0 tri3 CorrugatedTube_1 tet4" is in the interior This surface share two component. And I have defined it as default wall. Is it correct or wrong.
  4. How to open ".bc_warnings"

    How to open ".bc_warnings". As every time while giving run, it is asking to check this file before moving further. Regards Rajendra BorgWarner
  5. I am facing problem with boudary layer.

    When I am not maintaining BLs result is converging easily but showing wrong result. Only55 to 60% accuracy I am getting.

    When I am maintaining BL, result is not converging. The values are fluctuating so much,

    Actually modal is EGR coolar and has two flow i.e. coolant & Exhaust gas.

    In first trail, I solved with no BL, I got 60% accuracy. I got result trendy at very low time step 60, and I solved it for ten days till TS 1000, but result was same. There is no change.

     

    In 2nd trail, I am solving with BL at wall seperating coolant & gas. But here, result I am not getting trendy atleast. 300 TS, already completed, still no result.

     

    Solver is also very slow. Taking too much time. For each TS it is taking nearlly 20mins.

     

    I have attached inp & log file please find it.

    Please do needful as I wasted nearlly 1 month on it.

     

    Regards

    Rajendra Prasad

    BorgWarner Emission System

    CorrugatedTube_T2.2.Log

    CorrugatedTube_T2.inp

  6. ACUSOLVE

    I am facing problem with boudary layer. When I am not maintaining BLs result is converging easily but showing wrong result. Only55 to 60% accuracy I am getting. When I am maintaining BL, result is not converging. The values are fluctuating so much, Actually modal is EGR coolar and has two flow i.e. coolant & Exhaust gas. In first trail, I solved with no BL, I got 60% accuracy. I got result trendy at very low time step 60, and I solved it for ten days till TS 1000, but result was same. There is no change. In 2nd trail, I am solving with BL at wall seperating coolant & gas. But here, result I am not getting trendy atleast. 300 TS, already completed, still no result. Solver is also very slow. Taking too much time. For each TS it is taking nearlly 20mins. I have attached inp & log file please find it. Please do needful as I wasted nearlly 1 month on it. Regards Rajendra Prasad BorgWarner Emission System CorrugatedTube_T2.2.Log CorrugatedTube_T2.inp
  7. Hi sir,

    I am getting an error 2094 while solving FRF analysis, i.e.

     

     

    *** ERROR # 2094 ***
     EXCITEID on RLOAD2 # 9 data references follower force or nonexistent
     DAREA/static loading with ID # 4.

    ************************************************************************

     There were 2 error messages during input processing.
      The first message is repeated below:

      *** ERROR # 2094 ***
      EXCITEID on RLOAD2 # 9 data references follower force or nonexistent
      DAREA/static loading with ID # 4.


    ************************************************************************

     ==== End of solver screen output ====


     ==== Job completed ====

     

    inputs are

    Freq range: 50 to 500Hz.

    Gravity: 2G

    Damping: 2% & 4%( 2 simulations)

     

    Loads I applied are

    At the place of constraint, SPCD loads are also applied in all 3 dimention( towards specified dirc, 9810 N/mm2, load is applied).

    Tabled1 is applied, range of freq 50 to 500Hz & gravity 2G is applied

    Tabdamp is applied for damping i.e 2%

    RLoad2 applied to merge SPCD load and Tabled.

    Please help me, as I am running out of time.

    Capture1.PNG

    Capture2.PNG

    Capture3.PNG

  8. FRF error 2094

    Thanks for reply vikas, inputs are Freq range: 50 to 500Hz. Gravity: 2G Damping: 2% & 4%( 2 simulations) Loads I applied are At the place of constraint, SPCD loads are also applied in all 3 dimention( towards specified dirc, 9810 N/mm2, load is applied). Tabled1 is applied, range of freq 50 to 500Hz & gravity 2G is applied Tabdamp is applied for damping i.e 2% RLoad2 applied to merge SPCD load and Tabled. Load step Regards, Rajendra
  9. Hi sir, I am getting an error while solving FRF analysis, i.e. *** ERROR # 2094 *** EXCITEID on RLOAD2 # 9 data references follower force or nonexistent DAREA/static loading with ID # 4. ************************************************************************ There were 2 error messages during input processing. The first message is repeated below: *** ERROR # 2094 *** EXCITEID on RLOAD2 # 9 data references follower force or nonexistent DAREA/static loading with ID # 4. ************************************************************************ ==== End of solver screen output ==== ==== Job completed ==== Please help me, as I am running out of time. Regards Rajendra Prasad Borgwarner
  10. Error #5408 i.e "Modal Frequency Response Analysis"

    Thanks for reply sir..
  11. Error #5408 i.e "Modal Frequency Response Analysis"

    Thanks for reply sir
  12. ACUSOLVE

    Thanks for reply sir
  13. ACUSOLVE

    My CFD solve is running. I am working on EGR system(exhaust gas recirculation system). Its the thermal analysis. There are two fluid(air & coolant). Goal is to find outlet temperature of fluid i.e. air & coolant. My result is not converging. It's very big modal, nearly 40 million elements are formed. Each time step is taking nearly 30min. Now after nearly 96 hours, 160 time step is reached. Still its not converged. At TS 70, values looks more trendy. And at TS 120, solution was converged its best. But now at TS 160, results are not looking trendy. Now, I want result at TS 120. Is it possible, now solve is at TS 160? And, if any suggestions are there to coverge solve, then please suggest me.
  14. Messages for the job: *** ERROR # 5408 *** Aborting analysis because no structural modes have been computed in the modal dynamic subcase 1. *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED. I am not understanding why this error is comming. Please help me.
  15. Variable Pressure in Optistruct

    Yes, You are correct but what equation I have to put for variable pressure acting from 0.55Mpa to 0.055Mpa on tube changing magnitude along the circumference of tube. I dont know how to form the equation or how to use linear interpolation method. Can u give an example of it, please. Thanks for the reply Nguyen-Dai . 155
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