Read Error In Data Read Ansys
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Turbomachinery Products Fluid Dynamics Electronics Structural Analysis Systems Multiphysics Tips & Tricks Post navigation ← Previous Next → Use of *TREAD and *VREAD to read in data from an external file Posted on January 24, 2012 by troublenow7 Bringing data from a file into the ANSYS program for use in arrays or tables can lead to substantial time savings. The two primary commands to transfer data from an external file into an ANSYS parameter are *VREAD and *TREAD. http://www.cfd-online.com/Forums/cfx/87321-data-read-error-ansys-cfx.html *VREAD usually applies to arrays and *TREAD is for tabular data. However, the external file may not have the data formatted in the corresponding manner. *VREAD is restricted to fixed format while *TREAD can handle comma or tab delimited data. Prior to using either command you need to issue a *DIM command to set http://www.ansys-blog.com/use-of-tread-and-vread-to-read-in-data-from-an-external-file/ the type and size of the array or table. Starting with a data file that has 10 rows and 3 columns of numeric values and that has no header and is named rawdata.txt (or .csv). CASE 1) fixed format of F8.3 into an array *DIM,ARR1,array,10,3 *VREAD,ARR1(1,1),rawdata,txt,,JIK,3,10 (3F8.3) CASE 2) CSV format into a table - as a 2d table will always start with row and column 0 both of the row and column dimensions are reduced by 1 *DIM,TAB1,table,9,2 *TREAD,TAB1,rawdata,csv CASE 3) CSV format of 3 or more columns into an array - cannot be read directly using *VREAD so read into a table and copy the values to the array *DIM,TAB2,table,9,2 *TREAD,TAB2,rawdata,csv *DIM,ARR2,array,10,3 *MFUN,ARR2(1,1),copy,TAB2(0,0) *DEL,TAB2(1) CASE 4) For a data file of 10 rows and only 2 columns in CSV format: (special handling needed as a one dimensional table does not have any row 0) *DIM,TAB3,table,10 *TREAD,TAB3,rawdata,csv *DIM,ARR3,array,10,2 *MFUN,ARR3(1,1),copy,TAB3(1,0) *DEL,TAB3(1) The *STATUS command can be used to list the parameter conten
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Displaying and listing the results Error estimation Calculations among the results data Combining loaded cases Reading in data from the results file Because the solver writes results both to the database and to the results file, results data for single load step analyses are available for reviewing if you do not leave the program after solution. The SET command is still required for multiple load steps or if you leave the ansys program after solution. Reviewing Results without SET Command /PREP7 ... FINISH /SOLU ... SOLVE FINISH /POST1 ! SET not required PLNSOL,... ... Reviewing Results with SET Command /PREP7 ... FINISH /SOLU ... SOLVE FINISH /EXIT ! Exits program, automatically save database ... ANSYS ! Reenters ANSYS program RESUME ! Restores database /POST1 SET,... ! Reads results data from results file PLNSOL,... ... For solids and shells, most information is now available as nodal data. You don't need an additional command to store data such as strain, thermal gradient, thermal flux, etc. For line elements (beams, pipes, spars, etc.), use ETABLE command to gain access to derived data such as stress, strain, thermal gradient, thermal flux, etc. /POST1 SET,... ! If required ETABLE,SMIN_I,NMISC,2 ! SMIN_I is minimum stress at node I ETABLE,SMAX_I,NMISC,2 ! SMAX_I is maximum stress at node I You can list the table[PRETAB] or contour any of the table items[PLETAB] ***** POST1 ELEMENT TABLE LISTING ***** STAT CURRENT CURRENT ELEM SMAX_I SMIN_I 1 20667. -19333. 2 18667. -17333. 3 16667. -15333. 4 14667. -13333. 5 12667. -11333. ... Displaying and listing the results Many commands are available in POST1 to review results: PLNSOL contour plots (averaged) of nodal solution data (replaces PLNSTR) PLESOL contour plots (unaveraged) of element solution data. (replaces PLNSTR,,1) PLETAB contour plots (averaged or unaveraged) of element table data Several types of contour plots: /CTYPE, 0 standard 1 Is