sph 常用關(guān)鍵字手冊

1、1.*CONSTRAINED_GLOBAL 全局約束Purpose: Define a global boundary constraint plane. 定義一個全局平面邊界約束 TC Translational Constraint: 平動約束EQ.1: constrained x translation,EQ.2: constrained y translation,EQ.3: constrained z translation,EQ.4: constrained x and y translations,EQ.5: constrained y and z translations,EQ

2、.6: constrained x and z translations,EQ.7: constrained x, y, and z translations,RC Rotational Constraint: 轉(zhuǎn)動約束EQ.1: constrained x-rotation,EQ.2: constrained y-rotation,EQ.3: constrained z-rotation,EQ.4: constrained x and y rotations,EQ.5: constrained y and z rotations,EQ.6: constrained z and x rotat

3、ions,EQ.7: constrained x, y, and z rotations.DIR Direction of normal 正常的方向EQ.1: global x,EQ.2: global y,EQ.3: global z.X x-offset coordinate x方向偏移坐標(biāo)Y y-offset coordinate y方向偏移坐標(biāo)Z z-offset coordinate z方向偏移坐標(biāo)Remarks:Nodes within a mesh-size-dependent tolerance are constrained on a global plane. Thisop

4、tion is recommended for use with r-method adaptive remeshing where nodal constraints arelost during the remeshing phase.節(jié)點(diǎn)網(wǎng)格大小的依賴公差限制在全局坐標(biāo)平面上，這個選項要求使用在 適應(yīng)的重新劃分 節(jié)點(diǎn)約束消失在重新劃分階段。 zyxzx舉例說明：(多用在對稱面處)*CONSTRAINED_GLOBAL *CONSTRAINED_GLOBAL 1 5 1 X平動 Y、Z轉(zhuǎn)動 X法線方向 3 4 3 Z平動 X、Y轉(zhuǎn)動 Z法線方向 2. *SECTION_SPH SPH屬性設(shè)

5、置Purpose: Define section properties for SPH particles. 定義SPH粒子的屬性SECID SECID is referenced on the *PART card. A unique numberor label not exceeding 8 characters must be specified. 使用特定的PART編號，其號碼字符不能超過8個字符。CSLH Constant applied to the smoothing length of the particles. The default value applies for

6、most problems. Values between 1.05 and 1.3 are acceptable. Taking a value less than 1 is inadmissible. Values larger than 1.3 will increase the computational time. The default value is recommended. 該常數(shù)用于設(shè)置光滑粒子長度，默認(rèn)值應(yīng)用于大部分問題。設(shè)定值在1.051.3之間是可行的，值小于1不可行，值大于1.3會增加計算時間，建議取默認(rèn)值。HMIN Scale factor for the min

7、imum smoothing length (See Remark 1) 設(shè)置最小光滑長度的比例因子HMAX Scale factor for the maximum smoothing length (See Remark 1)設(shè)置最大光滑長度的比例因子SPHINI Optional initial smoothing length (overrides true smoothing length).This option applies to avoid LS-DYNA to calculate the smoothing length during initialization. In

8、this case, the variable CSLH doesnt apply. 選擇初始的光滑長度（覆蓋初始的光滑長度），這個選項用于避免LS-DYNA在初始化過程中計算光滑長度。在這種情況下，CSLH的作用就會失效。DEATH Time imposed SPH approximation is stopped. SPH近似算法停止時間START Time imposed SPH approximation is activated. SPH近似算法激活時間Remarks:1. The SPH processor in LS-DYNA uses a variable smoothing

9、length. LS-DYNA computesthe initial smoothing length, h0, for each SPH part by taking the maximum of the minimum distance between every particle. Every particle has its own smoothing length which varies in time according to the following equation:h(t) is the smoothing length, div(v) is the divergenc

10、e of the flow. The smoothing length increases when particles separate from each other and reduces when the concentration ofparticles is important. It varies to keep the same number of particles in the neighborhood.The smoothing length varies between the minimum and maximum valuesDefining a value of

11、1 for HMIN and 1 for HMAX will result in a constant smoothinglength in time and space.1.SPH處理程序在LS-DYNA中使用變光滑長度。LS-DYNA計算初始光滑長度，h0，對于每一個SPH部分最小的距離在每個微粒之間。每個微粒都有它自己的光滑長度，隨時間變化的方程如下：h(t) 是光滑長度，div(v) 是流動的散度。當(dāng)粒子相互分離時光滑長度增加， 3.*ELEMENT_SPH SPH單元Purpose: Define a lumped mass element assigned to a nodal p

12、oint . 定義集中質(zhì)量單元分配給一個節(jié)點(diǎn)NID Node ID and Element ID are the same for the SPH option.節(jié)點(diǎn)編號和單元編號對于SPH要相同。PID Part ID to which this node (element) belongs. 節(jié)點(diǎn)或單元所屬的PART組MASS Mass value 質(zhì)量值4.*CONTROL_SPH SPH控制設(shè)置Purpose: Provide controls for computing SPH particles 為計算SPH粒子提供控制設(shè)置NCBS Number of cycles between

13、 particle sorting 粒子分類搜索循環(huán)次數(shù)BOXID SPH approximations are computed inside a specified BOX. When a particle has gone outside the BOX, it is deactivated. This will save computational time by eliminating particles that no longer interact with the structure. 指定BOX內(nèi)的SPH粒子參與計算。當(dāng)某個SPH粒子位于BOX之外時，該粒子失效，通過消除某些

14、不再與結(jié)構(gòu)發(fā)生作用的粒子，可以節(jié)省計算時間。DT Death time. Determines when the SPH calculations are stopped. 粒子失效時間IDIM Space dimension for SPH particles: SPH粒子的空間維數(shù)3 for 3D problems 參數(shù)為3時，表示3維問題。2 for 2D plane strain problems 參數(shù)為2時，表示2維問題。-2 for 2D axisymmetric problems參數(shù)為-2時，表示軸對稱問題。When a value is not specified LS-DYN

15、A determines the space dimension automatically by checking the use of 3D, 2D or 2D asisymmetric elements. 當(dāng)這個值無法自動指定LS-DYNA的維數(shù)，程序通過核對使用3維、2維或軸對稱的單元來確定空間維數(shù)。MEMORY Defines the initial number of neighbors per particle. This variable is just for memory allocation of arrays during the initialization phas

16、e. During the calculation, some particles can request more neighbors and LS-DYNA will automatically adapt the size of that variable. Default value should apply for most applications.定義每個粒子的初始相鄰粒子的數(shù)量，該變量只是在初始化階段調(diào)整內(nèi)存分配。在計算中，如果某些粒子需要更多的相鄰粒子，LS-DYNA會自動調(diào)整該變量設(shè)置。默認(rèn)值適用于大部分問題。FORM Particle approximation theo

17、ry: 粒子近似理論EQ. 0: default formulation, 默認(rèn)公式EQ. 1: remormalization approximation 重歸-近似化START Start time for particle approximation. Particle approximations will be computed when time of the analysis has reached the value defined in START. 粒子近似開始時間。當(dāng)分析時間達(dá)到所設(shè)定的值時，粒子將開始計算。 MAXV Maximum value for velocity

18、 for the SPH particles. Particles with a velocity greater than MAXV are deactivated SPH粒子速度最大值，如果速度超過該值，質(zhì)點(diǎn)將會失效。CONT Defines the computation of the particle approximation between two different SPH parts: 兩個不同的SPH組之間粒子近似的計算設(shè)置。EQ. 0: Particle approximation is defined (default)參數(shù)設(shè)為0 計算粒子近似（默認(rèn)值）EQ. 1: Pa

19、rticle approximation is not computed. Two different SPH materials will not interact with each other and penetration is allowed. 參數(shù)設(shè)為1 不計算粒子近似，兩種不同的SPH材料不會發(fā)生相互作用，允許相互穿透。DERIV Time integration type for the smoothing length: 光滑長度的時間積分類型。5.*BOUNDARY_SPH_SYMMETRY_PLANE 對稱平面邊界設(shè)置Purpose: Define a symmetry plane for SPH. This option applies to continuum d