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  • The PHI and PHIDA files
    worth of variable is written with the format format 1X 6 1PE13 6 An extract of Fortran code to read the fields section might look like DO IZ 1 NZ DO IPHI 1 M READ LU 1X 6 1PE13 6 PHI IPHI IX IY IZ IY 1 NY IX 1 NX ENDDO ENDDO where M is the total number of STOREd variables Note that if more values are written than the formt allows for each logical line will be written as several physical lines in the file Other Data After the field values come a number of further lines which are not needed for post processing These are next line if PRPS is stored the values of the properties read from the PRPS file format 1X 6 1PE13 6 next line three integers format 1X 3I10 being the number of patchwise variables NFPWVT the number of F array elements allocated directly by the user via NFUSER and number of F array elements allocated using GXMAKE NFGMAK next line NFPWVT reals written with format 1X 6 1PE13 6 next line NFUSER reals written with format 1X 6 1PE13 6 next line NFGMAK reals written with format 1X 6 1PE13 6 It is not possible to recreate any of these fields outside Earth If a PHI file is being generated artificially they can be omitted To prevent Earth trying to read them the 3rd real on line 4 RNFPWV should be set to any negative value If MOFOR is active there follow a series of lines which contain the transformation matrices needed to move the moving objects to their correct positions This sequence of lines starts with a header line MOFOR NREFF format A8 I6 where NREFF is the number of frames of reference to write Following this there will be NREFF sets of lines Frame name format A 16 reals format 1X 6 1PE13 6 where Frame name is the name of the moving object The frame names are also echoed near the top of the RESULT file If the file is being ead for post processing then once the field values have been read the rest of the file can be read as character strings until the MOFOR header is detected or the end of file is reached PHIDA file format The content of unformatted direct access files saved and read by EARTH is as follows The header The first ten records of this file contain header information namely rec1 contents of TEXT and version information ie character 40 run title and character 25 version information rec2 CARTES ONEPHS BFC XCYCLE CCM LCMPRS ie 6 logicals rec3 NX NY NZ NPHI DEN1 DEN2 EPOR NPOR HPOR VPOR LENREC NUMBLK NMATST NFMAK1 ie 14 integers rec4 RINNER FLOAT NPRPHI RNFPWV FLOAT NFMAK2 RDMAT1 1 FLOAT IDMAT2 ie 6 reals rec5 NAME I I 1 NPHI ie NPHI names each character 4 rec6 x locations of east cell faces ie NX reals rec7 y locations of north cell faces ie NY reals

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/phif.htm (2016-02-15)
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    1 from West north RG 30 2 from East RG 30 3 from South RG 30 4 from North RG 1 density of the fluid on the left side of the track RHO2 density of the fluid on the right side of the track left side right There are two parts in the Q1 file the first part from Group 1 to Group 23 is for standard Q1 settings and the second part after Group 23 is for GENTRA settings The most convenient way for users to set a problem is to load GENTRA library case g722 and then modify the first part according to the problem description and then modify only Group 2 of the GENTRA settings that is Boundary conditions for particles Users should specify the initial particle positions there The program will automatically perform a linear interpolation between particles in order to adjust the distance between two adjacent particles Therefore only two particles need to be specified for a straight line of the initial distribution as described in case 722 For other shapes of the initial distribution users have to specify a sufficient number of particles to produce the desired result Sub routine trkden htm in phoenics

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/partic.htm (2016-02-15)
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    which the phi1 equation contains a term such as phi2 phi1 linkco the phi2 equation contains a corresponding term phi1 phi2 linkco and the linking coefficient linkco is so large that these terms greatly exceed all the others The purpose of the PEA is to prevent the slow down of convergence which without it large linking coefficients inevitably produce 2 Where it is used in PHOENICS The Partial Elimination algorithm was first introduced for two phase flow problems for the obvious reason that when the two intermingled flows are very finely divided the coefficient linking the first phase temperature say with the second phase temperature is extremely large Later when the IMMERSOL model of radiative heat transfer was introduced into PHOENICS slow convergence was encountered whenever the emissivity of the radiating medium was very high The PEA was therefore applied to this situation also the two linked variables being TEM1 the first phase temperature and T3 the radiative temperature It is also permissible as is sometimes preferred in combustion simulations to use H1 the first phase enthalpy in place of TEM1 The user needs to take no action in order to activate the PEA for these situations Its action is automatic Internally the PEA is coded within PHOENICS so as to be able to handle an arbitrary number of linked variables users wishing to avail themselves of the facility are asked to contact CHAM for advice giving details of the variables in question and especially of the linking terms It should be remarked that the linkage does not have to be linear indeed it is not for IMMERSOL for which the linking term equals constant TEM1 4 T3 4 3 Its nature The PEA operates by substituting for phi2 in the phi2 phi1 term above a best estimate of what

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/pea.htm (2016-02-15)
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    variable to a particular phase can be changed by means of the TERMS command See also the individual entries for P1 H2 NAME and NPHI PHI Photon Help PHI is used to specify the name of a PHOENICS PHI or PHIDA file which PHOTON will attach Before loading the grid PHOTON enables you to specify grid scaling factors If the file is for a BFC run PHOTON will prompt for the name of an XYZ file Entering a slash in response to the filename prompt will abort the file opening command See also XYZ NEW PICS PICS PICS PHOTON Internal Coordinate System is the coordinate system used by PHOTON to draw graphical elements line text etc on output devices It is a two dimensional system say x y with the origin located at the bottom left hand corner of the display are eg the screen or paper The coordinates used are normalised to the ranges 0 to 4095 in the x direction and 0 to 3120 in the y direction PICS units are used to specify the position of the text drawn through the TEXT command when issued within a USE file and the geometry features drawn through the GEOMETRY command PHI FILES PHI DA Photon Help Enter the name of PHI DA file here PHIDA See PHENC entry PHI FILES PHINT PIL real array group 9 sect 8 9 Satellite Help default 20202 0 PHINT phi interface value of the variable indicated PHINT is an array carrying a real number value for each variable i e phi which indicates when two phases are present and interphase transport is active what value prevails immediately at the interface on the side of the phase in question For the purpose of interphase transport the phases are treated in pairs Thus U1 index no 3 is paired with U2 4 H1 14 is paired with H2 15 See TERMS for further information a When neither PHINT of the pair retains its default value If PHINT is given any value other than GRND or GRND1 GRND2 etc that value will be used for the interface value in calculation of the transfer rate between the bulk of the phase and the interface Otherwise EARTH will call GROUND group 9 section 8 for phase 1 or section 9 for phase 2 expecting to find that the user has provided an array of phi values pertaining to the interface A common use of PHINT is for the specification of the interface enthalpies of say steam and water as being those valid for thermodynamic equilibrium at the prevailing pressure If the pressure is almost uniform through the field the use of constant values of PHINT will suffice but varying pressure would dictate the use of PHINT GRND because the pressure influencing the saturation enthalpies can be known only during the course of the calculation The options provided in GREX are as follows PHINT H1 GRND1 selects the interface value of H1 equal to HUNIT PHNH1A pressure PRESS0 PHNH1B

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/phi.htm (2016-02-15)
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  • The PREFIX file
    allpro PREFIX is read by the SATELLITE EARTH PHOTON AUTOPLOT and PINTO programs for file descriptor data needed during program execution The parameters which it sets are PHIDA T or F Use direct access or sequential PHI file XYZDA T or F Use direct access or sequential XYZ file IPRE T or F Use default filenames as defined at installation time or allow interactive input of data file names LPHI

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/prefix.htm (2016-02-15)
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    the grid coordinates When PHOTON is used as a pre processor for examination of BFC grids it requires access only to the grid file When PHOTON is used to replay previously stored pictures neither a fields file nor a grid file is needed PHOTON HELP Photon Help Help is available under the following headings BLOCK CLEAR CLEAR R COLOUR CONTOUR CLEAR CONTOUR DELETE CONTOUR OFF CONTOUR ON CONTOURS COORDINATES DASH DOMAIN DRAW R DUMP DUMP R END ESCAPE EXTRAPOLATE FILE R GEOMETRY GEOMETRY CLEAR GEOMETRY DELETE GEOMETRY OFF GEOMETRY ON GEOMETRY READ GEOMETRY SAVE GEOMETRY CMDS GRID CENTRE GRID CLEAR GRID DELETE GRID HATCH GRID OFF GRID ON GRID OUT GRIDS HATCH LIST R LOG MAGNIFY GRID MIRROR MONOCHROME R NEWS NOCLEAR R PAUSE PHI PICS PREFIX FILE REDRAW REDRAW R REPLAY RESET R ROTATE SAVE SCALE R SCREEN SENDP SENDP R SET SET AXES SET BOX SET CONTOUR FILL SET CONTOUR SCALE SET CONTOUR UNITS SET GEOMETRY SET HOLD SET LHAND SET ORDER SET POROSITY SET PROPERTY SET RHAND SET VECTOR AVERAGE SET VECTOR BOUNDARY SET VECTOR CENTRE SET VECTOR COMPONENTS SET VECTOR KEY SET VECTOR PHASE SET VECTOR REFERENCE SET VECTOR UNITS SHIFT R SHOW STOP STREAM STREAM 2DIMENSTION STREAM 3DIMENSTION STREAM CLEAR STREAM DELETE STREAM OFF STREAM ON SURFACE CLEAR SURFACE DELETE SURFACE OFF SURFACE ON TEXT TEXT CLEAR TEXT COLOUR TEXT DELETE TEXT LIST TEXT MOVE TEXT REPLACE TEXT SIZE TEXT UNDERLINE UMAGNIFY GRID U UP UPAUSE U UREWIND U USE USHIFT U UTEXT U VECTOR CLEAR VECTOR DELETE VECTOR OFF VECTOR ON VECTORS VIEW WHERE R XYZ 4VIEW R To get help on any item listed above type the item name followed by a question mark e g CONTOUR OFF Items marked with an asterisk give help on selected topics and are not PHOTON commands while items marked R refer to subcommands of the REPLAY command Commands marked U may only be issued from a USE file In help entries command names are shown thus CON tour ON element number where the minimum abbreviation for the command is shown in capitals with the rest of the command in square brackets Any abbreviation of the full name down to the minimum will be accepted Parameters are shown in angle brackets the program will prompt for essential parameters if they are not given on the command line Note also that PHOTON contains a built in set of tutorials which are accessed by typing m on the command line This Encyclopaedia article describes the pre Windows PHOTON Those who prefer the Windows look and feel can read about the more modern WinPHOTON by clicking here PHOTON help further information The following PHOTON items are provided here because they cannot be conveviently placed elsewhere in an alpahabetically ordered encyclopaedia X Photon Help The vector is in positive X direction Y Photon Help The vector is in positive Y direction Z Photon Help The vector is in positive Z direction X Photon Help The vector is in negtive X direction

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/photon.htm (2016-02-15)
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  • Cylindrical-polar coordinates
    can be made at will in either direction The X direction is now the circumference q measured in radians The Y direction is the radius r measured in metres The Z direction is the axis z measured in metres The inner radius of the domain is set via RINNER This sets the distance from the axis of symmetry to the cylinder y 0 The origin of the polar system is at the origin of the cartesian system The Z axis is common to both When the polar X 0 the Y axis aligns with the cartesian Y When looking along Z towards the origin with Y pointing up X increases in the clock wise direction as shown below VR Objects in Polar Coordinates The treatment of object size is described here and object position here To summarise the position of the bounding box origin is always set in polar coordinates The size can be in polar coordinates whenever a default geometry is used or in cartesian coordinates whenever a non default geometry is used This allows objects to either follow the grid when they change size or to keep their proper shapes The image below shows two objects both with

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/polar.htm (2016-02-15)
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  • POLIS, the PHOENICS On-Line Information System
    enc containing those embodying the content of the alphabetically ordered PHOENICS Encyclopaedia d lecs containing those concerned with lectures d tuts containing those concerned with tutorials of which more are to be found in d wkshp the words workshop and tutorial being used as synonyms However there is more information in the less helpfully named d info d phoen and d spp the last being nominally concerned with Special Purpose Programs As is to be expected of a body of information which has been accumulating for over thirty years PHOENICS was first released for public use in October 1981 POLIS contains material of varied styles degrees of modernity and let it be at once admitted correctness for the software has been growing in power continuously and what might have been properly recommended in 1989 or 1999 may have become less than the best now Because the sheer quantity of information provided may bewilder newcomers the PHOENICS Commander has been supplied with a new user page for their guidance A visit to that page may be their wisest first step More experienced information seekers who already know what topics they are interested in are advised to turn first to the Encyclopaedia

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_enc/encpolis.htm (2016-02-15)
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web-archive-uk.com, 2016-10-27