Fluids

Fluids

A question about the ICFD in LS DYNA

    • Weidong
      Subscriber

      Hi,

      I am dealing with a Simulation of objects entering water. However, I am a beginer and can not handle some problem.

      Could you please give me some suggestion about my cases? It seems there are duplicated elements in my case.

      Thanks so much.

      Best regards,

      Weidong

    • Karthik R
      Administrator
      Hello,nWhich tool are you using and what is your end goal? Do you need to see the impact of flow on these objects? Are these objects moving in the flow field?nKarthikn
    • Weidong
      Subscriber
      Hi,nThanks so much for your comments. I plan to study the impact on objects. The objects is moving in the flow filed.nBy now, I have difficult to run this case. It seems there is something wrong with my case settings.nBest regards,nWeidongn
    • Karthik R
      Administrator
      Hello, nCan you confirm if you are using LS Dyna for this?nKarthikn
    • Weidong
      Subscriber
      Hi,nActually, I am not sure if Ls DYNA is suitable for my work.nI want to simulate the collision of two objects on the floating water surface.I used to simulatie some collision cases by LS DYNA, and it works well. Besides, the ICFD function is also available now.Therefore, I would like to try LS DYNA for my work.nBest,nWeidongn
    • Rob
      Ansys Employee
      How fast is the collision? LS Dyna is for fast events, for floating objects AQWA may be suitable. n
    • Weidong
      Subscriber
      Hi,nThanks for your coments.nThe speed is around 1~2 m/s. I think LS DYNA could be ok for my collision case, just I am not sure if DYNA is also good at fluid.nBest,nWeidongn
    • Karthik R
      Administrator
      Hi,nLet me forward this question over to an LS Dyna expert to get their inputs.nKarthikn
    • Weidong
      Subscriber

      Hi,Let me forward this question over to an LS Dyna expert to get their inputs.Karthikhttps://forum.ansys.com/discussion/comment/112119#Comment_112119

      Thanks so much for your help.n
    • Reno Genest
      Ansys Employee
      Hello Array,nnDo you need to include the water? For a ship impacting another ship simulation with LS-DYNA, we typically don't include the water. The mass of the ship is so large that the water effect is insignificant. All you need is the initial velocity of one ship just before impact with the other ship or object.nhttps://www.dynalook.com/conferences/european-conf-2001/57.pdf/viewnnIf you have a boat floating on water, you can model the water using ALE. Here are some good papers:nnArraynArraynhttps://www.dynalook.com/conferences/international-conf-2004/04-1.pdf/viewnAnd some simple examples:nnArraynnIf you want to go with ICFD, have a look at these examples first:nnhttps://www.dynaexamples.com/icfd/intermediate-examplesnnAnd do a search for ICFD on dynalook.com for some good papers.nnLet me know how it goes.nnReno.n
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