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Iterative and transient numerical models for flow simulation of injection pultrusion

机译：注射拉挤流动仿真的迭代和瞬态数值模型

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摘要

During injection pultrusion, the flow front is initially transient and approaches a quasi-steady-state in a short time. It is the steady-state flow front that determines the filling quality of the pultruded composite part. Both transient and iterative finite element/ nodal volume models have been developed to predict the steady-state flow fronts during injection pultrusion processes. In the present paper, the numerical performance of the transient and iterative models is systematically investigated for various pultrusion process and material parameters, such as pull speed, injection pressure and the ratio of permeabilities in the pulling and the transverse directions. It is shown that the iterative model is numerically stable and robust. It predicts steady-state flow fronts which are in excellent agreement with those predicted by the transient model in all the cases investigated. More importantly, the iterative model is much more efficient than the transient model and the high efficiency is not affected by the modelling parameters used. It generally uses less than one tenth of the computer time required by the transient model to reach the converged solutions. Therefore, the iterative model should always be used to predict the steady-state resin flow fronts.
机译：在注射拉挤成型过程中，流动前沿最初是瞬态的，并在很短的时间内接近准稳态。稳态流动前沿决定了拉挤复合部件的填充质量。已经开发了瞬态和迭代有限元/节点体积模型来预测注塑拉挤成型过程中的稳态流动前沿。在本文中，系统地研究了瞬态和迭代模型在各种拉挤成型工艺和材料参数（例如拉速，注射压力以及拉向和横向渗透率）方面的数值性能。结果表明，迭代模型在数值上是稳定的和鲁棒的。它预测的稳态流场在所有研究的情况下都与瞬态模型预测的流场非常吻合。更重要的是，迭代模型比瞬态模型有效得多，并且高效率不受所用建模参数的影响。通常，它使用瞬态模型所需的计算机时间不到总时间的十分之一。因此，应始终使用迭代模型来预测稳态树脂流动前沿。

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