General Mechanical

General Mechanical

Phase changes in thermal analysis using APDL

    • helen.durand
      Subscriber
      Hello!nIn the thermal analysis guide under section 3.8 (Phase Change) (https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_the/Hlp_G_THE3_9.html), it states the following:nUse lower-order thermal elements, such as PLANE55 or SOLID70. If you have to use higher-order elements, choose the diagonalized specific heat matrix option using the appropriate element KEYOPT. (This is the default for most lower-order elements.)nWhen specifying transient integration parameters, set THETA to 1, so that the Euler backward difference scheme is used for the transient time integration. (THETA defaults to 0.5.)nnWhy does it recommend to use lower-order thermal elements and the Euler backward difference scheme?nAlso, where exactly do I set values of THETA (or using what command)?nThanks!n
    • Ashish Khemka
      Ansys Employee
      Hi,nnPlease refer the link below:nnnRegards,nAshish Khemkan
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