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  • generated by the formulae below in an Excel spreadsheet Basic formulae angle of crank omega time first equation for engine crank length r therefore end of crank is at x r cos angle of crank y r sin angle of crank end of connecting rod is at X 0 and distance L from the end of crank Simple geometry says that y piston y L cos theta and theta asin

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_lecs/mofor/descrmof.htm (2016-02-15)
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  • The MOFOR Input-File library
    at 45 degrees v115 diagonal click here Cylinder in chaotic motion v114 chaotic click here Cube rotating about its centre v121 rotblock click here Rolling cube translation rotation v120 rolblock click here Sphere in horizontal motion v128 linearx click here 2 cylinders with crossing trajectories v124 twocylin click here Falling box with broken tip v112 brokntip click here Applications Title Q1 mof file animation Underwater launch v118 launch click here

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_lecs/mofor/moflib.htm (2016-02-15)
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  • Setting-up the attributes of moving objects via MOF data file
    and resulting velocity fields Independent motions crossing paths The case exemplifies the setting up the attributes for the independent movements of two objects following their own linear trajectories in 2D Y Z computational space The movement of the first object called CYL1 starts from its stationary position at the low south corner The velocity of CYL1 is uniform and the components in Y and Z direction are both given as 4 m s The second object CYL2 starts at high south corner of the domain and follows the linear trajectory crossing the one of CYL2 It has the constant velocity component of 3 m s in Z direction and 3 m s in Y direction The hierarchy part of MOF file is as follows HIERARCHY UNITS METRES ROOT Cham JOINT CYL1 CHANNELS 2 Yposition Zposition End Site JOINT CYL2 CHANNELS 2 Yposition Zposition End Site Two CHANNELS are defined for each object the movement is along Y and Z axis The initial position and the sizes of the objects are taken from the Q1 file The time dependent part of the data reads MOTION Frames 2 Frame Time 1 0 0 0 0 4 4 3 3 The Motion section defines the time dependent positions The file contains 2 sets of positions arranged in four columns The first two columns are for CYL1 first one defines Y and second one defines Z position At time 0 Y and Z positions are 0 plus the offset automatically calculated from initial position of CYL1 in CFD domain At time 1 sec Y and Z positions are 4 m which correspond the velocity components of 4 m s The next two columns are for CYL2 third one defines Y and the fourth one defines Z position At time 0 Y and Z positions are 0 plus the offset automatically calculated from initial position of CYL2 At time 1 sec Y position is 3 m which corresponds the velocity components of 3 m s In contrast Z position is set as 3 m to provide 3 m s for the velocity component in that direction as required Click here to view the animated motions of the objects through computational domain velocity vectors are not shown The complete MOF file can be downloaded from here To run the simulation Run VR editor load Library case V124 run Earth and VR viewer to see the movements and resulting velocity fields Connected objects falling of a cracked wall The case exemplifies the setting up the attributes for the connected movements of two objects following their relative rotation in 2D Y Z computational space The movement of the first object called BLOCK starts from its stationary position as a vertical wall with its base placed next to the middle of the bottom domain boundary BLOCK is allowed to fall It does so by rotating clockwise about X axis of its south high corner The angular velocity of the fall is 75 degrees per second Initially the second smaller object TIP sits stationary on the top of BLOCK and can be regarded as a part of the wall Once the whole wall starts to fall it cracks and TIP begins to move in opposite direction by rotating counterclockwise about X axis of the north low corner of the BLOCK The angular velocity of the TIP relative to the BLOCK is 180 degree per second The hierarchy part of MOF file is as follows HIERARCHY UNITS METRES ROOT Cham JOINT BLOCK OFFSET 0 0 0 0 2 1 CHANNELS 1 Xrotation JOINT TIP OFFSET 0 0 2 5 0 5 CHANNELS 1 Xrotation End Site Two JOINTS are defined BLOCK is a parent joint and TIP is the BLOCK s child The OFFSET of BLOCK defines the position of the rotation axis relative to the ROOT frame it places the origin of parent related coordinate frame at the south high corner of BLOCK initial position Only one of the CHANNELS is defined for parent JOINT the rotation about X axis The OFFSET of TIP defines the position of the rotation axis relative to the BLOCK frame it places the origin of its coordinate frame at the north low corner of BLOCK initial position Only one of the CHANNELS is defined for child JOINT the rotation about X axis The time dependent part of the data reads MOTION Frames 2 Frame Time 1 0 0 75 180 The Motion section defines the time dependent positions The file contains 2 sets of positions arranged in two columns The first column is for parent BLOCK to define its angular position in degrees of rotation At time 0 there is no rotation so that the angular position is 0 At time 1 sec the angular position is 75 degrees It gives the required fall velocity The angle is positive as needed for clockwise direction of rotation The next column is for child TIP to define its angular position in degrees of rotation At time 0 there is no rotation so that the angular position is 0 At time 1 sec the angular position is 180 degrees It gives the required velocity of TIP rotation The angle is negative to provide counterclockwise direction of rotation Click here to view the animated motions of the objects through computational domain velocity vectors are not shown The complete MOF file can be downloaded from here To run the simulation Run VR editor load Library case V112 run Earth and VR viewer to see the movements and resulting velocity fields Engineering applications Rotating blade impeller Impellers are the units one most commonly associates with stirred reactors The particular design considered here consists of the ROD mounted on rotating vertical SHAFT The rod carries two PADDLEs which agitate the flow The paddles are allowed to rotate in different directions about the axis of the rod As the impeller rotates it forces the surrounding fluid to rotate with it The design with rotating paddles is used when in depth mixing is

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/mofor/mof/learnmof.htm (2016-02-15)
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  • Problem description
    OK Step 7 Monitoring locations and view Change X Y and Z of Position to 0 1 Click on Reset and then Fit to window Click on Mouse on the movement control panel and use the mouse to change the geometry view position as shown below Step 8 Pressure relief Click on Settings New and New Object on the top bar menu Change Name to RELIEF Click on BLOCKAGE of Type Locate PRESSURE RELIEF Click on OK Step 9 Initial concentration Click on Settings New and New Object on the top bar menu Change Name to FLU1IN Click on Size and set SIZE of the object as XSize 0 2 YSize 0 5 ZSize 0 5 Click on General and then on Shape Click on Default of Geometry A browser window will appear Locate cubet dat in public shapes and click on Save Click on Options Click on Transparency and set value to 50 Click on General Click on BLOCKAGE of Type and select USER DEFINED Click on Attributes Set New to INIF1 Click on Apply Change Type to INIVAL Change Coefficient of C1 to 0 0 Change Value of C1 to 1 0 Click on Apply Click on OK Click on OK Step 10 Initial position of SHAFT object Click on Settings New and New Object on the top bar menu Change Name to SHAFT Click on Size and set SIZE of the object as XSize 0 35 YSize 0 05 ZSize 0 05 Click on Place and set POSITON of the object as XPos 0 15 YPos 0 225 ZPos 0 225 Click on General and then on Shape Click on Default of Geometry Locate cylinder dat in public shapes Click on Save Click on Options and then on Rotation options Set Rotate Object Face to 9 and click OK Click on General Click on Attributes Click on Other materials of Types Locate Domain material and click on OK Click on Options and de activate Object affects grid Click on OK Step 11 Initial position of ROD object Click on Settings New and New Object on the top bar menu Change Name to ROD Click on Size and set SIZE of the object as XSize 0 05 YSize 0 25 ZSize 0 05 Click on Place and set POSITION of the object as XPos 0 125 YPos 0 125 ZPos 0 225 Click on General Click on Shape and Default of Geometry Locate cylinder dat in public shapes Click on Save Click on Options and then on Rotation options Set Rotate Object Face to 5 and click OK Click on General Click on Attributes Click on Other materials of Types Locate Domain material and click on OK Click on Options and de activate Object affects grid Click on OK Step 12 Initial position of PADDLE1 object Click on Settings New and New Object on the top bar menu Change Name to PADDLE1 Click on Size and set SIZE of the object as XSize 0 1 YSize 0 1

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/mofor/agitated/agitate.htm (2016-02-15)
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  • SPEDAT SET MOFOR MOFFILE C DOM MOF

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_lecs/mofor/frag1.htm (2016-02-15)
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  • JOINT DMAIN OFFSET 0 3 0 9 0 0 CHANNELS 1 Zrotation End Site end of moving object OFFSET 0 0 0 0 0 0

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_lecs/mofor/frag2.htm (2016-02-15)
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  • Flow around a walking man Flow in an oblique channel Single cylinder with fine grid embedding Turn around duct Flow around automobile Supersonic 2D flow past a diamond shaped object Moving cylinders Moving cylinders in a tunnel Oscillating valve velocities

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_applic/movsol/movsol.htm (2016-02-15)
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  • Some details of the PARSOL method
    whether points lay inside or outside and the obscurity of the intersection calculation Moreover as implemented no advantage was taken of the economies which can be made when the flow situation to be simulated is two rather than three dimensional The 2DPM coding was thus found after intensive study to have several drawbacks of which the most serious were It could not be relied upon always to detect intersections between facets and cell edges because of lack of control of tolerances i e the differences of distance between what was and what was not an intersection It could not directly treat the commonly occurring two dimensional flow situations but had to convert them into pseudo three dimensional ones which was at best uneconomical and at worst contributed to the missed intersection phenomenon Even when intersections were correctly deteced and their positions computed the excessive amount of computation involved imposed a serious delay on the start up of the true CFD calculations The two dimensional section method 2DSM It was for these reasons that the alternative 2DSM method was invented The 2DSM proceeds as follows The object intersection is detected plane by plane Preliminary selection is used to make sure the detection is applied only to those facets which could possibly intersect with the plane by checking the dimensions of the bounding box of the object in question The intersection between a plane and a facet edge is a segment with start and end points The segment complies with the in on the right convention which means the right side of the segment is in the object The facet is slightly extended to avoid missing an intersection when the plane just touches the facet Once all the segments within the plane are obtained together with the indications of whether the left

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_docs/parsol/parsol.htm (2016-02-15)
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web-archive-uk.com, 2017-12-16