S7-1PAT301, Section 7, October 2003 SECTION 7 FIELDS. - презентация

1 S7-1PAT301, Section 7, October 2003 SECTION 7 FIELDS

2 S7-2PAT301, Section 7, October 2003

3 S7-3PAT301, Section 7, October 2003 FIELDS n Fields are used to define variation in u Load/boundary conditions u Material Properties u Element Properties n There are three types of fields u Spatial fields u Material Property fields u Non-Spatial fields

4 S7-4PAT301, Section 7, October 2003 SPATIAL FIELDS n Spatial Fields – variation of the field with respect to: u Physical coordinate system coordinates, e.g. X,Y,Z u Parametric coordinates, e.g. 1, 2 u Analysis results u User-defined mix of allowable independent variables and compiled PCL functions CFD - Inlet VelocityPlate Thickness

5 S7-5PAT301, Section 7, October 2003 MATERIAL PROPERTY FIELDS n Material Property fields – variations of the field with respect to: u Temperature, Strain, Strain Rate, Time, and Frequency u User-defined mix of allowable independent variables and compiled PCL functions

6 S7-6PAT301, Section 7, October 2003 NON-SPATIAL FIELDS n Non-Spatial fields – variation of the field with respect to: u Time, Frequency, Temperature, Displacement, and Velocity u User-defined mix of allowable independent variables and compiled PCL functions LEGEND model

7 S7-7PAT301, Section 7, October 2003 SPATIAL FIELD EXAMPLE PCL/SCALAR/REAL SPACE n Describe a variable thickness for a plate model u Thickness varies l 0.2 at the leading edge (T = 0) l 0.6 at the trailing edge (T = 1.57) l As a function of SIN, where Theta varies from 0 to 90 degrees T=1.57 T=0 Thickness = *SINR( T) R T Z

8 S7-8PAT301, Section 7, October 2003 SPATIAL FIELD – PCL INPUT n PCL expressions can be defined with up to 3 spatial variables Mathematical ExpressionPCL Expression Rectangular0.1x y.1*X-.35*Y Cylindrical0.35r acos(25.6z)0.35*R+.08*T*acosr (25.6*Z) Spherical200r *R**2-P**3 Parametric – *C1-20.8*C2 n The following variables are recognized as part of a PCL function SpatialNon-Spatial Coordinate Frame RectangularXYZTime t CylindricalRTZFrequency f SphericalRTP ParametricC1 C2 C3 n Variables are case sensitive n Precede all variables with a single quote() – not backquote

9 S7-9PAT301, Section 7, October 2003 PCL MATH FUNCTIONS n SIND (angle) n SINR (angle)* n ASIND (n) n ASINR (n) n COSD (n) n COSR (n) n ACOSD (n) n ACOSR (n) n TAND (angle) n TANR (angle) n ATAND (n) n ATANR (n) n ATAN2D (y, x) n ATAN2R(y, x) Note: T and P are in radians for cylindrical and spherical coordinate systems (e.g use SINR(T)) * R indicates that the angle is specified in radians n SQRT (n) n LN (n) n EXP (n) n LOG (n) n ABS (n) n SIGN (n) n NINT (n) n MAX (n1, n2,…) n MIN (n1, n2,…)

10 S7-10PAT301, Section 7, October 2003 SPATIAL VECTOR FIELD n Inlet velocity fields can be easily defined with the vector field option n Vector fields can be defined with respect to any reference coordinate system X Y Flow

11 S7-11PAT301, Section 7, October 2003 SPATIAL FIELD – TABULAR INPUT n Tabular input u Field data values can be entered into 1, 2, or 3-dimensional spreadsheets LEGEND xy1 X pressure 0 psi 10 psi 30 psi 60 psi

12 S7-12PAT301, Section 7, October 2003 SPATIAL FIELD EXAMPLE n Define a linearly varying thickness using corner points (endpoints) of surface u Select Coordinate System Type as Parametric u Select the Geometry Entity for the application of the parametric field, e.g. Surface 1 u Select dimensionally (1D, 2D, 3D) to be used in the field definition u Input data, e.g. corner thickness Tabular Input/Parametric Space/Endpoints Only C1 C2 (0,0) (0,1) (1,1) (1,0)

13 S7-13PAT301, Section 7, October 2003 SPATIAL FIELD EXAMPLE (Cont.) n Define a piecewise linearly varying field in parametric space to represent thickness of Surface 1 Tabular Input/Parametric Space/Endpoints Only Off (1/4,1) (1,0) (1,1) (1/4,0) (3/4,0) (0,0) (3/4,1) (0,1) C2 C

14 S7-14PAT301, Section 7, October 2003 FEM FIELDS n Two types of FEM Fields are available: discrete and continuous u Discrete FEM Fields define data associated to a list of nodes or elements; no interpolation is performed u Continuous FEM Fields are used to map data (interpolate) from one analysis to another (thermal to structural) or from one mesh to another (global to local analysis) n Vector FEM Fields are created from displacements and forces n Scalar FEM Fields are created from pressures and temperatures

15 S7-15PAT301, Section 7, October 2003 CREATING DISCRETE FEM FIELD n Specify Discrete, Vector and Node n Select or type node IDs into Select a Node in Input Data form, then click Return n Input vector data, e.g., for Values n Can use this in Loads/BCs

16 S7-16PAT301, Section 7, October 2003 CREATING CONTINUOUS FEM FIELD n Procedure to create continuous FEM Field u Display desired results on mesh, e.g. temperature at nodes. Field is created using the data that corresponds to the display u Select Continuous for FEM Field Definition, and select type of field, e.g. Scalar for temperature u Select the group that has the results displayed on it. Make sure display matches field type selected u Choose proper extrapolation option u Do not delete mesh that was used to create FEM field, e.g. thermal model u Use the FEM field in creating a Load/BC, e.g. structural thermal load

17 S7-17PAT301, Section 7, October 2003 MATERIAL PROPERTY FIELD – TABULAR INPUT n Material Properties can be specified as a function of Temperature, Strain, Strain Rate, Time, and Frequency n Example: tabular input of elastic modulus defined as a function of temperature and strain

18 S7-18PAT301, Section 7, October 2003 NON-SPATIAL FIELDS – TABULAR INPUT n Time dependent fields may be used to define transient variation of loads and boundary conditions n Value vs. Time: values can be entered in tabular format or as a PCL expression n PCL Expression uses t as independent variable 10*sinr(100* t) 100*MYFUNCTION(20.,.3, t)

19 S7-19PAT301, Section 7, October 2003 SHOWING FIELD DATA n Fields may be shown with an X-Y Plot n One independent variable must be selected LEGEND model

20 S7-20PAT301, Section 7, October 2003