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    a solid line Dash Photon Help The line type of the current GRID Dash Photon Help The line type of the current VECTOR Dash Photon Help The line type of the current CONTOUR element if it was drawn with isolines Dash Photon Help The line type of the current STREAMLINES element Dash Photon Help The line type of the current SURFACE element Dash Photon Help Dash specifies the line type for Line Polyline Arc and Circle Dashed lines in AUTOPLOT If a plot contains several data elements you may wish to distinguish them by using various kinds of dashed lines This may be effetced by way of by the DOTn command which is used in the same way as the PLOT command The n in this command represents a single digit and must not be preceded by a space The value of n determines the type of dashed line to be used as follows DOT1 Short Dash DOT2 Dash Dot DOT3 Medium Dash DOT4 Long Dash DOT5 Very Long Dash Some of the dashed lines generated by these commands may differ slightly depending on the graphics terminal used Suppose you wish to plot three sets of data the first drawn

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/dash.htm (2016-02-15)
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    keys and levels respectively from being deleted during CLEAR Data communication by SATELLITE to GROUND see GROUP 19 DATA DELETE command in AUTOPLOT The DATA DELETE command erases the last element whereas DATA CLEAR deletes all elements The command CLEAR deletes all elements including text and keys if they have not been kept for a fresh start Data elements association with line type The plotting commands that have been described so far ie PLOT DOTn and BLBn each plot all those data elements which are in memory but do not appear on the screen and whose status is ON The line type used remains associated with the data element s drawn and subsequent REDRAW commands will retain the same line types for the data elements in question You can also use the same commands to change the line types of individual data elements or ranges of data elements already appearing on the screen For example PLOT 3 will plot or redraw the third element using solid lines and DOT3 2 5 will plot or redraw the second to the fifth elements inclusive using medium dashed lines Data elements drawing of in colour In the same way that elements can be drawn with PLOT DOT and BLOB you can use the command COLOURh to draw an element in colour h Here h is a hexadecimal number representing the colour to be used The standard PGI colour map has colour 0 as the background colour 1 as the normal drawing and writing colour and colours 2 to 15 F ranging from blue to red If a particular data element is not already on the screen COLOUR will draw it with a solid line If it has already been drawn with PLOT DOT or BLOB it will be redrawn with the same line style but in the new colour Thus COLOURE 3 5 will plot or redraw elements 3 to 5 inclusive in colour E 14 dark orange The use of COLOURh without arguments will plot in memory all elements in colour h but it will not draw or redraw them on the screen Data elements generation of by Digitising The command DIGITISE causes the graphics cursor to appear for use in picking values from the screen Data points are picked by pressing particular keys as shown below C To get the coordinates and continue digitising The digitised points will be joined by a solid line G K To get the coordinates using BLB1 BLB5 to mark the points Y To close the generated profile and exit An extra data point is generated with the same coordinates as the first point X To exit without the last set of coordinates Any other key to exit with coordinates The points will be saved as the next data element and can be treated just as any other data element Under certain circumstances it is possible to configure AUTOPLOT to accept data from a digitising tablet or digitising drawing board In such cases the DIGITISE command

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/data.htm (2016-02-15)
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  • List of Geometry DAT files
    dat sidepan2 dat spiral floor dat submarine dat tuyaux dat wheel dat wing dat wuaful dat wuawel dat In directory phoenics d satell d object public flair miscllns floor2 dat roofvis2 dat side1 dat side2 dat solid5 dat In directory phoenics d satell d object public formul 1 These geometries are used by the F1 in schools version back whl dat balsa dat balsa gt dat balsa r dat co2 can dat denfordex dat design 2 r6 dat frnt whl dat grndprix dat jag f1 dat In directory phoenics d satell d object public furnture archs dat barheat dat bigben dat blinddwn dat blindup dat bseat2 dat build1 dat build2 dat build3 dat chair1 dat chair2 dat chair2s dat chairs dat chairs3 dat cooker dat cpseat dat desk dat factory dat filecab dat fire dat fire2 dat front dat gantrys dat house1 dat kettle dat light dat microwav dat monitor dat plants dat plants1 dat postbox dat rad1 dat radiator dat scatty dat smoke dat soilcorn dat strplite dat table dat telly dat temp dat tower0 dat window dat window1 dat window2 dat window3 dat window4 dat In directory phoenics d satell d object public human man dat man2 dat man2 0 dat person dat seated dat woman dat In directory phoenics d satell d object public mofor These geometries are used by some MOFOR library cases acjet dat chamsoft dat drivers1 dat engine dat skijmpv3 dat In directory phoenics d satell d object public polar These geometries are designed for use in cylindrical polar coordinates They will follow the X grid polcorner dat polcube dat polqsph dat polwedge dat polwire dat In directory phoenics d satell d object public shapes This folder contains primitives which can be used to build up more complex shapes box dat coil dat cone dat corner dat cube dat cylinder dat half cone dat half cylinder dat half pyramid dat half sphere dat hexagon dat octagon dat pipebend dat prism dat pyramid dat quarter cone dat quarter cylinder dat quarter pyramid dat quarter sphere dat sphere dat tallwedge dat wedge dat In directory phoenics d satell d object public tutorial These geometries are used in some of the tutorials complete dat comple 0 dat land dat main pod dat pod el 1 dat pod el 2 dat slopes dat towers dat wheel 0 dat In directory phoenics d satell d object public usp These geometries are used in some of the UnStructured PHOENICS library cases fluidreg dat prmat 1 dat prmat 2 dat u704 dat u707 dat The following geometry files are in the process of being withdrawn They may be used but it is not guaranteed that they will always remain available In directory phoenics d satell d object public deprecated shapes 10 dat 11 dat 14 dat 2cyls dat 3bens dat 4 dat 8 dat ahcyl dat arch dat block dat cbe dat cencube1 dat cencube2 dat cube1 dat cube10 dat cube11 dat cube12 dat cube12t dat cube13 dat cube14 dat cube15

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/datfiles.htm (2016-02-15)
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    the square cavity with a moving lid DEBUG T DBSOL2 T DBGPHI U1 T ISWDB1 10 ISWDB2 10 LSWEEP 10 Different versions of PHOENICS and different computers may give somewhat different numbers and indeed print out lay outs However the general principles of debug interpretation remain the same cell by cell imbalances before solution for mphi 3 ithyd 1 at iz 1 isweep 10 imbl 5524 IY 10 2 798E 08 1 184E 06 9 002E 06 3 794E 05 3 464E 05 IY 8 2 652E 08 2 037E 06 2 741E 06 2 384E 05 3 442E 06 IY 6 1 615E 08 2 768E 07 3 398E 06 1 374E 05 4 174E 07 IY 4 1 152E 08 6 524E 07 3 707E 06 4 373E 06 4 201E 07 IY 2 4 407E 09 2 448E 07 1 232E 06 8 692E 07 1 997E 08 IX 1 3 5 7 9 The above print out comes from the subroutine which calls the linear equation solver The same values appear below beneath the index k3su the value of which is the zero location of the variable in th F array It will be seen that the parameters NXPRIN and NYPRIN here 2 and 2 which govern the frequency of variable field print out are effective also for debug print out start of subroutine solver 170800 MFI ITHY 3 IZSTEP 1 ISWEEP 10 ISTEP 1 variable is U1 dbg1 T dbg2 T dbg3 F slbsol T pbp F sol T selref T resref 5 275407E 08 endit 1 000000E 03 slbsol or not sol 3d coefficients arranged slab by slab first iz 1 last iz 1 iz 1 k3ap 5424 IY 10 3 065E 04 9 920E 04 1 450E 03 1 357E 03 9 959E 04 IY 8 5 441E 04 1 525E 03 2 145E 03 1 637E 03 1 198E 03 IY 6 7 732E 04 2 408E 03 3 732E 03 2 844E 03 1 281E 03 IY 4 5 803E 04 1 786E 03 2 693E 03 1 880E 03 6 260E 04 IY 2 2 439E 04 7 452E 04 1 127E 03 7 627E 04 2 485E 04 IX 1 3 5 7 9 iz 1 k3su 5524 IY 10 2 798E 08 1 184E 06 9 002E 06 3 794E 05 3 464E 05 IY 8 2 652E 08 2 037E 06 2 741E 06 2 384E 05 3 442E 06 IY 6 1 615E 08 2 768E 07 3 398E 06 1 374E 05 4 174E 07 IY 4 1 152E 08 6 524E 07 3 707E 06 4 373E 06 4 201E 07 IY 2 4 407E 09 2 448E 07 1 232E 06 8 692E 07 1 997E 08 IX 1 3 5 7 9 iz 1 k3ae 4124 IY 10 0 000E 00 0 000E 00 0 000E 00 0 000E 00 0 000E 00 IY 8 0 000E 00 0 000E 00 0

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/debug.htm (2016-02-15)
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    the flow and of the fluid Selection of the special expressions from among those which are is effected by choosing one or other of the available turbulence models See PHENC entry TURBULENCE Ordinarily many equations of the above type have to be solved simultaneously because they are linked in various ways The mass continuity equation for phase i is obtained by setting Fi to unity in the above differential equation with the result d ri rhoi dt div ri rhoi Vi ri Si Here Si represents the mass inflow rate into the phase per unit volume of space for example by transfer from another phase with which it is intermingled When a single phase phenomenon is in question the volume fraction ri disappears from the equations which thus become d rho F dt div rho V F rho G f grad F S and d rho dt div rho V 0 The zero on the right hand side of the second equation results from the fact that there can be no finite mass source when the second phase is absent When several phases are present their volume fractions are subject to the constraint Sum ri 1 The differential equations presented above are the instantaneously valid ones PHOENICS solves these for laminar flows For turbulent flows PHOENICS can solve equations that are time averaged It is presumed that the time over which the averaging is made is long compared with the time scale of the turbulent motion but in transient problems it must also be small compared with the time scale of the mean flow The correlations which this averaging produces between velocity fluctuations and scalar fluctuations denoted by r rho u F are usually approximated by means of a gradient transport hypothesis thus r rho u F7gt Gt grad F

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/differ.htm (2016-02-15)
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  • Discretization in PHOENICS
    the north neighbour S the south neighbour W P E E the east neighbour W the west neighbour H the high neighbour T L the low neighbour T the neighbour in the S earlier time direction L The grid points can be thought of as being at the centres of a stack of boxes i e the volume elements so shaped as to fill entirely the space in which the fluid flows Strictly speaking the statement about the dependent variable locations being within the cells requires modification for PHOENICS computes values of velocities for locations on the walls of the cells The following diagram illustrates this a single cell with four of its neighbours being shown in plan view N n e W P E S Temperatures pressures and concentrations are evaluated by PHOENICS for the locations like P N S E W which lie within cells but west to east velocities are evaluated for the cell wall locations like w and e and south to north velocities are evaluated for locations like s and n A three dimensional diagram would show in addition the low and high neighbour points for pressures etc viz L and H and the low

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/discret.htm (2016-02-15)
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    volume fractions and the velocity field in a two phase process the chemical species concentrations in a reacting flow the pressure and the density in a compressible flow the turbulence energy and its dissipation rate in a turbulent flow and many other variables If the non convergence is thought to originate in the linkage between the flow field and a boundary condition as is often true of the fluctuations mentioned above it may be beneficial to impose a LOCAL freezing This can be effected by defining a source patch for the region of interest and then setting the third argument of the associated COVAL as a large number such as 1 E10 and the fourth argument as SAME c Under relaxation as a cure for divergence If freezing by very severe under relaxation restores convergent behaviour it is obviously possible that modest under relaxation will have the same qualitative tendency while still allowing the solution to proceed so that all residuals do finally diminish the residuals of frozen variables incidentally do not diminish The use of under relaxation is by far the most common means of securing convergence in practice If employed indiscriminately it can lead to waste of computer time however when it is applied to just those equations that have been identified as potential causes of divergence and in just the amount that is necessary to procure convergence it is probably the best first recourse remedy to apply PHOENICS is equipped with a device called EXPERT for adjusting under relaxation factors automatically It cannot be expected to make the correct choices in extremely complex circumstances but it is always worth trying See PHENC entry EXPERT d The use of limits The VARMAX and VARMIN quantities can also be useful in preventing divergence particularly when this is associated with a poor starting field for the iterative process which allows some variables at first to stray outside the physically meaningful range VARMAX and VARMIN can be employed in two distinct ways they may set upper and lower bounds to the values of the dependent variables themselves or they may set limits to the changes in these values in a single adjustment cycle See PHENC entry VARMIN The values of VARMAX and VARMIN can of course be chosen differently for each dependent and auxiliary variable but there is no built in way of applying them over restricted regions at present However it is easy for a user who is willing to introduce coding in GROUND to do this for himself for the functions FN22 and FN23 are available for applying limits to any variable over regions defined locally by IXF IXL IYF etc e Linearisation of sources Source terms can be introduced in GROUND either directly or in a linearised manner The first involves ascribing a single quantity for each cell viz the source itself the second involves ascription of two quantities the coefficient and value See PHENC entries COVAL and BOUNDARY CONDITIONS Suppose that the source of variable j S

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/diverg.htm (2016-02-15)
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  • Documentation
    Encyclopaedia Index PHOENICS Documentation Major documents Lectures on PHOENICS

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_docs/introdoc/introdoc.htm (2016-02-15)
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