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[耦合分析] ALE 平滑因子 AFAC

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发表于 2016-5-8 15:40:14 | 显示全部楼层 |阅读模式 来自 瑞典
最近在研究流固耦合ALE 算法中, 对于control ALE 关键字下的 AFAC 平滑因子 不是很理解, 各位大侠可否谈一下自己对 这个参数的理解!
 楼主| 发表于 2016-5-8 15:59:09 | 显示全部楼层 来自 瑞典
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是不是把 AFAC设为-1,不考虑平滑 就想当与采用了Lagrangian算法
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 楼主| 发表于 2016-5-9 13:39:36 | 显示全部楼层 来自 瑞典
本帖最后由 周舟 于 2016-5-9 13:41 编辑

自己回答一下
  
MESH SMOOTHING
  
There is a subclass of ALE modeling referred to as mesh smoothing in which the
mesh conforms to the exterior boundary of the ALE material and the elements are
reshaped using any of several smoothing algorithms. After the elements are smoothed,
material advection occurs. Although this smoothing approach is available in LS-DYNA,
it is less general and less robust than the case in which the ALE mesh need not conform
to the material boundaries. Thus the ALE smoothing approach in LS-DYNA is not
discussed any further in these modeling guidelines. Instead, when ALE is discussed,
focus will be on the general ALE approach.
  
  
In addition, all the fluid elements are set up to be an ALE multi-material group
so that each element has a specific material property and the ALE formulation tracks
the motion of the elements in the numerical simulation. Note that the ALE control
settings are essential. In our numerical model, the number of time steps between mesh
smoothing and advection cycles, which could speed up run time but reduce stability,
is determined to be unity based on the consideration of computational stability. The
first order advection method is applied and it is efficient and accurate for the water.
An option is selected (the AFAC value is set at -1) to ensure that no significant
element distortion is allowed in the numerical simulation; only expansion and
contraction are permitted.

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 楼主| 发表于 2016-5-9 21:20:00 | 显示全部楼层 来自 瑞典
ALE 需要定义*ALE REFERENCE SYSTEM GROUP 以确定ALE 网格的运动情况。
如果不定义,则ALE 转变为EULERIAN

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发表于 2016-5-10 16:56:55 | 显示全部楼层 来自 四川成都
看了一下相关关键字,非常有收获。谢谢楼主
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