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January 26, 2011, 15:52 |
Microsoft windows .net framework v2.0 should be work
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#21 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
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March 28, 2011, 21:54 |
Injection code doubts
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#22 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Hello everyone
Since the source (sandia uv) is the same, i´m wondering if anyone can explain to me the injection code? I was able to compile the udf whith sucess but i´m with doubts on creating the injection code file, because i don´t understand the parameters. My case is 2D what means: ! plane: desired plane for injection points (xy, xz, yz) - My case is 2D and the plane of the flow is xy, shold i select xz. Or this could be a problem? i don´t know what this coordinates are? ! coord: axial coordinate of the plane (m) ! coord1: 1st coordinate of injection-plane centroid (m) ! coord2: 2nd coordinate of injection-plane centroid (m) Thank you and if anyone needs help with the udf for fluent 12.1 contact me |
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March 28, 2011, 22:00 |
Injectionfile
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#23 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
x y z . u v w, temperature, diameter, density, id
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March 29, 2011, 17:11 |
display udf
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#24 |
Member
rose
Join Date: Dec 2010
Posts: 30
Rep Power: 16 |
hi all ,
i have this udf but i can'nt display it in fluent ; #include <udf.h> DEFINE_PROPERTY (dyn_surf_tension, cell, thread) { real dst; real t=CURRENT_TIME; dst=141121*pow(t,5) - 38978*pow(t,4) + 3817.5*pow(t,3) - 148.84*pow(t,2) + 1.3033*pow(t,1) + 0.071; return dst; thank you |
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April 20, 2011, 09:18 |
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#25 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Hello everyone
Just two questions: does it matters the material used for particles? And should i select the uv interaction on dpm model? Or does sandia files regards this problem. Real thanks |
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April 20, 2011, 10:03 |
massless
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#26 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
it is massless particle type . from file injection.
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April 20, 2011, 10:04 |
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#27 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
just particle tracking in dpm
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April 20, 2011, 10:14 |
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#28 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Thanks. I´m not using the injections from the file but a group injection cause i don´t want a circular injection, but the principle is the same.
Another question: anyone using this tipe of simulation on transient state? I´m with doubts if there is any equation to determine the step length factor? real thanks |
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April 20, 2011, 10:19 |
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#29 |
New Member
limin
Join Date: May 2009
Posts: 21
Rep Power: 17 |
STEP LENGTH FACTOR is as better as smaller depend your mesh size, usually the particle travel one mesh one step, and if you can manage 10+ step in one mesh cell should be much better
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April 20, 2011, 11:53 |
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#30 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Thanks zhang.limin
I didnt quite understand the last answer. I´ve a structured mesh but the size of each cell is differente since i use a progression nearby the cylinder (UV lamp) because of wall behaviour. My domain is 1.08 meters in the flow direction, and i have 270 cells in the same direction. But the smallest cell near the wall (cylinder) have aproximated 1.54e-4 meters of length. In this case what is the max STEP LENGTH FACTOR or even the specified length scale that i should use in order to a particle travel one cell in one timestep. One more time real thanks |
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April 27, 2011, 13:46 |
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#31 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Hello everyone
I´ve one question: How do you define red constants A and B? My problem is that i only have acess at this time to numerical values(fluent). I´m using a model used for numerical solutions where: RED=1/k*ln((1/number of particl.)*sum(exp(-k*Di)) Ni/No=exp(-k*Di) Where Di is the dose of each particle and k is a coefficient of the first order of inactivation of a microbe. Anyone have other solutions or sugestions? Thanks |
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May 25, 2011, 12:15 |
it´s possible to use this in unsteady dpm tracking?
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#32 |
New Member
Join Date: Feb 2011
Posts: 16
Rep Power: 15 |
Hello everyone.
Regarding Sandia UDf, it´s possible to use this in unsteady dpm tracking? I have a problem with this UDF using unsteady particle tracking, because the scalar is updated to a new value and will not retain the last. I want to measure the total U.V. dose in each particle on the output boundary, but I only get the last value of UV dose, and not the total. I´m a beginner user to UDF but there is any way to change this, to retain the values of UV dose each dpm time step? /************************************************** *********************/ /* UDF for computing the UV dosage along a particle trajectory */ /************************************************** *********************/ #include "udf.h" #include "dpm.h" #include "sg_disco.h" #define fileuv "output.dpm" #define C_DO(c,t)C_STORAGE_R_XV(c,t,SV_DO_IRRAD,0) static real uv_intensity_0; static real x0, y00, z0; FILE *fuv; DEFINE_DPM_SCALAR_UPDATE(uv_dosage, cell, thread, initialize, p) { cphase_state_t *c = &(p->cphase); if (initialize) { p->user[0] = 0.; uv_intensity_0 = C_DO(cell,thread); x0=p->state.pos[0]; y00=p->state.pos[1]; z0=p->state.pos[2]; } else { p->user[0] += P_DT(p) * .5 * (uv_intensity_0 + C_DO(cell,thread)); uv_intensity_0 = C_DO(cell,thread); } } DEFINE_DPM_OUTPUT(uv_output, header, fp, p, thread, plane) { char name[100]; if (header) { fuv = fopen(fileuv,"w"); if (NNULLP(thread)) { fprintf(fuv,"(%s %d)\n",thread->head->dpm_summary.sort_file_name,14); } else fprintf(fuv,"(%s %d)\n",plane->sort_file_name,14); fprintf(fuv,"(%10s %10s %10s %10s %10s %10s %10s" " %10s %10s %10s %10s %10s %10s %10s %s)\n", "X0","Y0","Z0", "X","Y","Z","U","V","W","diameter","T","mass-flow", "time","UV-Dosage","name"); fclose(fuv); } else { fuv = fopen(fileuv,"a"); sprintf(name,"%s:%d",p->injection->name,p->part_id); fprintf(fuv, "((%10.6g %10.6g %10.6g %10.6g %10.6g %10.6g " "%10.6g %10.6g %10.6g %10.6g %10.6g %10.6g %10.6g %10.6g) %s)\n", x0,y00,z0, p->state.pos[0], p->state.pos[1], p->state.pos[2], p->state.V[0], p->state.V[1], p->state.V[2], p->state.diam, p->state.temp, p->flow_rate, p->state.time, p->user[0], name); fclose(fuv); } } |
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Tags |
fluent, help me, udf |
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