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Why does decreasing element size will increase the accuracy within my FEA results?

    • Rameez_ul_Haq
      Subscriber
      We are already aware of the general fact that decreasing the mesh element size (or in other words, incorporating more mesh elements) increases the accuracy of our results (displacements, stresses etc). Furthermore, if we decrease the mesh element size, if there is any singularity area, it will start becoming more and more compact while the maximum stresses within that singularity will begin to increase, to reach inifnity.nMy question is, why does this happen? What is the basic theory behind this? Explanation without complex equations will be appreciated. If there are any research papers explaining the reasoning behind this, kindly recommend.n
    • Rameez_ul_Haq
      Subscriber
      Anyone with an insight on this?n
    • Rahul Kumbhar
      Ansys Employee
      Simple answer is element uses area around the gauss point to calculate stress. As you refine the mesh, the area becomes small, hence the stresses goes to infinity for singularity.n
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