讲座题目：A level set based immersed boundary method for simulation of non-isothermal viscoelastic melt filling process

主办单位：三峡数学研究中心/理学院

报告专家：李强 副教授（扬州大学）

报告时间：2021年12月1日（周三） 上午（10:00—12: 00）

报告地点：腾讯会议（ID： 730 238 7023；密码：123321）

专家简介：李强，扬州大学数学科学学院副教授，硕士生导师。2012年4月毕业于西北工业大学应用数学专业，获博士学位，同年5月入职河南理工大学。2018年2月至2019年2月在巴西巴拉那联邦大学数学系进行博士后研究工作。2021年入职扬州大学。主要从事偏微分方程数值解、计算流体力学和注塑成型数值模拟的研究工作，在流体自由界面追踪、注塑成型的多尺度模型和算法等方面取得了一系列研究成果，近年来共发表学术论文20余篇，其中以第一作者身份发表SCI期刊论文10余篇。主持并完成国家自然科学基金青年项目、国家自然科学基金天元项目、河南省科技厅高新领域“科技攻关”项目、河南省教育厅科学技术研究重点项目以及巴西教育部高教人才培训基金项目等国家级、省部级项目5项。

报告摘要： In this work, the polymer melt filling process is simulated by using a coupled finite volume and level-set based immersed boundary (LS-IB) method. Firstly, based on a shape level set (LS) function to represent the mold boundary, a LS-IB method is developed to model the complex mold walls. Then the non-isothermal melt filling process is simulated based on non-Newtonian viscoelastic equations with different Reynolds numbers in a circular cavity with a solid core, and the effects of Reynolds number on the flow patterns of polymer melt are presented and compared with each other. And then for a true polymer melt with a small Reynolds number that varies with melt viscosity, the moving interface, the temperature distributions and the molecular deformation are shown and analyzed in detail. At last, as a commonly used application case, a socket cavity with seven inserts is investigated. The corresponding physical quantities, such as the melt velocity, molecular deformation, normal stresses, first normal stress difference, temperature distributions and frozen layer are analyzed and discussed. The results could provide some predictions and guidance for the polymer processing industry.

报告时间：2021年12月1日（周三） 上午（10:00—12: 00）

报告地点：腾讯会议（ID： 730 238 7023；密码：123321）

专家简介：李强，扬州大学数学科学学院副教授，硕士生导师。2012年4月毕业于西北工业大学应用数学专业，获博士学位，同年5月入职河南理工大学。2018年2月至2019年2月在巴西巴拉那联邦大学数学系进行博士后研究工作。2021年入职扬州大学。主要从事偏微分方程数值解、计算流体力学和注塑成型数值模拟的研究工作，在流体自由界面追踪、注塑成型的多尺度模型和算法等方面取得了一系列研究成果，近年来共发表学术论文20余篇，其中以第一作者身份发表SCI期刊论文10余篇。主持并完成国家自然科学基金青年项目、国家自然科学基金天元项目、河南省科技厅高新领域“科技攻关”项目、河南省教育厅科学技术研究重点项目以及巴西教育部高教人才培训基金项目等国家级、省部级项目5项。

报告摘要： In this work, the polymer melt filling process is simulated by using a coupled finite volume and level-set based immersed boundary (LS-IB) method. Firstly, based on a shape level set (LS) function to represent the mold boundary, a LS-IB method is developed to model the complex mold walls. Then the non-isothermal melt filling process is simulated based on non-Newtonian viscoelastic equations with different Reynolds numbers in a circular cavity with a solid core, and the effects of Reynolds number on the flow patterns of polymer melt are presented and compared with each other. And then for a true polymer melt with a small Reynolds number that varies with melt viscosity, the moving interface, the temperature distributions and the molecular deformation are shown and analyzed in detail. At last, as a commonly used application case, a socket cavity with seven inserts is investigated. The corresponding physical quantities, such as the melt velocity, molecular deformation, normal stresses, first normal stress difference, temperature distributions and frozen layer are analyzed and discussed. The results could provide some predictions and guidance for the polymer processing industry.