Contact Models
接触模型
A contact model describes how elements behave when they come into contact with each other. Using the Interaction pulldown menu and + pick-list, you can build a list (stack) of contact models. The top element is applied first, then the next one down and so on. U the up and down buttons to move the contact model up and down the list (check the ctions below since some models need to be at the start or end of the list). To remove an item, click the x button. Click the preferences button to configure the lected model.（接触模型描述了元素间的接触行为。使用Interaction下拉列表和按钮“+”来添加一系列接触模型。EDEM优先采用列表中的最前列的接触模型，优先级依次下移。用户可以使用up和down按钮来上下移动列表中接触模型的排列。点击按钮“X’’来删除列表中的模型。点击Configure按钮来设置所选中接触模型的参数配置。）
Every simulation must have at least one ba particle-to-particle and one particle-to-geometry contact model. EDEM is supplied with veral integrated contact models; you can
also add your own custom plug-in contact models. Refer to the ur ction of the DEM website and the鸭肠怎么炒好吃EDEM Programming Guide for details.（所有仿真必须至少包含一个基础的颗粒-颗粒和颗粒-几何体接触模型。EDEM提供了几个可选的接触模型，你也可以添加自定义的接触模型插件。更多细节的查询可以到DEM用户网站查询）
Hertz-Mindlin (no slip)（Hertz-Mindlin无滑动接触模型）
Hertz-Mindlin (no slip) is the default contact model.（EDEM中默认的接触模型）
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Interaction相互作用 | Configurable Parameters参数的设置 | Position |
Particle to Particle | None | Last |
Particle to Geometry | Record Relative Wear (On / Off) The Relative Wear model is a way of identifying regions of high impact (normal) and abrasive (tangential) wear on the equipment within a simulation. It is calculated bad on the relative velocity and associated forces between the bulk material and the equipment. This model provides the ur with additional data to indicate regions in which wear is taking place. Whilst it provides quantitative values for comparison between two or more design iterations, it does not determine an explicit material removal rate. 相对磨损的记录（开/关） 相对磨损是一种识别仿真中设备的高冲击（法向）和磨损（切向）区域的方法。这种方法是基于疏散物料与设备的相关力和相对速度计算的。这个接触模型提供用户额外的数据来表征相对磨损发生的区域。与此同时，这种计算方法提供了两次及两次以上的仿真设计数值的对比，但是并不能精确的计算材料的损失率。 | Last |
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Note: The Relative Wear model does not take into account the size of each element so a large variation in mesh sizing might produce unexpected or confusing results.
注意：相对磨损模型不计每个单元的尺寸大小，因此网格尺寸如果变化很大可能会产生不可知和不可控的结果。
Hertz-Mindlin (no slip) with RVD Rolling Friction
Hertz-Mindlin (no slip) with RVD Rolling Friction calculates contact forces in the same way as the Hertz-Mindlin (no slip) model, but offers an alternative implementation of rolling frictions at contacts. Since this model includes Hertz-Mindlin, remove the default no-slip contact model from the list.
Hertz-Mindlin(无滑动)滚动摩擦模型
该接触模型计算接触力的方式与赫兹-梅德灵无滑动模型一样,但是在接触中它另外运用了
滚动摩擦力。既然该模型包括赫兹-梅德灵模型，在接触列表中就需要移除默认的 Hertz-Mindlin(无滑动)接触模型。
Interaction | Configurable Parameters | Position |
Particle to Particle | None | Last |
Particle to Geometry | 美国人的生活习惯Record Relative Wear (On / Off), e Hertz-Mindlin | Last |
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Hertz-Mindlin with Archard Wear 艾查德（Archard）磨损-赫兹-梅德灵接触模型
Hertz-Mindlin with Archard Wear 乌梅的功效与作用model provides the ur with an explicit measurement of material removed from expod equipment faces due to sliding/abrasive wear during a bulk materials handling process. It is bad on the determination of a calibration constant动漫人物头像男 that can be defined through the appropriate material testing.
该接触模型可以提供用户精确的测量在散装物料搬运与输送过程中产生的设备材料损耗。该模型的计算是基于材料物理实验的校准常数的测定。
Interaction | Configurable Parameters | Position 非上不可 |
Particle to Geometry | Assign a Wear Constant value for each geometry ction. Record Relative Wear (On / Off), e Hertz-Mindlin | Last |
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Hertz-Mindlin with Heat Conduction
Hertz-Mindlin with Heat Conduction calculates the heat flux between particles in contact. The model calculates a heat flux bad on the particle temperatures and their overlap. This model must be ud with Update Temperature particle body force to complete the calculation. The Update Temperature particle body force allows the inclusion of an external heat source and is where each particle temperature is calculated bad on the heat flux calculated in the contact model and a given external heat flux.
诠释的近义词
Make sure the Update Temperature particle body force model is added to the particle body force model. Since this model includes Hertz-Mindlin, remove the default no-slip contact model from the list.
Interaction | Configurable Parameters | Position |
Particle to Particle | Set the thermal conductivity for each type of particle. Note the unit depends on the temperature unit; for example, the unit will be W/mK when the temperature unit is kelvin. | Last |
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Hertz-Mindlin with Bonding（Hertz-Mindlin粘结模型）
Hertz-Mindlin with Bonding bonds particles together. Since this model includes Hertz-Mindlin, you should remove the default no-slip contact model from the list.
To u, enable the bonding model for both particle-particle and particle-geometry interactions. Although particles cannot be bonded to geometry elements, the bonded model ensures that the particles contact the geometry bad on the particle’s physical radius and not the contact radius.
