CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

UDF velocity and temperature

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 22, 2009, 09:07
Default UDF velocity and temperature
  #1
Raj
Guest
 
Posts: n/a
Hi

My problem involves variation of velocity as well as temperature at the inlet boundary condition(BC). I have a UDF for variation of velocity and plugged in the velocity inlet BC after interpreting it. AFter writing a UDF for temperature variation, I could not plug in this UDF in the momentum column of velocity inlet BC.

Velocity & Temperature varitaion UDF is written using DEFINE_PROFILE function.

Iam a new user of UDF.PLease help me. How to give both variations in single velocity inlet BC.

Regards Raj.
  Reply With Quote

Old   January 22, 2009, 09:22
Default Re: UDF velocity and temperature
  #2
Emad
Guest
 
Posts: n/a
Dear Raj see example velocity profile should be writing this UDF in C_programing or C++ and save at as CPP extension file. after interpreting this UDF find it at boundary condition. with best regads emad **************************************** vprofile.c

UDF for specifying steady-state velocity profile boundary condition ************************************************** **********************/ #include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; /* this will hold the position vector */ real y; face_t f;

begin_f_loop(f, thread)

{

F_CENTROID(x,f,thread);

y = x[1];

F_PROFILE(f, thread, position) = 20. - y*y/(.0745*.0745)*20.;

} end_f_loop(f, thread) }

  Reply With Quote

Old   January 23, 2009, 02:25
Default Re: UDF velocity and temperature
  #3
Raj
Guest
 
Posts: n/a
Thanks Emad.
  Reply With Quote

Old   February 1, 2009, 19:29
Default Re: UDF velocity and temperature
  #4
Rogerio Fernandes Brito
Guest
 
Posts: n/a
hOW TO USE EXPERIMENTAL data and not an equation, for time-dependent heat flux boundary condition ?

My data (of time and heat flux) are these listed below:

t [s] q" [w m^-2]

0.000000e+00 -5.987137e+01 2.220000e-01 -5.728233e+01 4.440000e-01 -5.685082e+01 6.660000e-01 -5.857685e+01 8.880000e-01 -5.943986e+01 1.110000e+00 -5.943986e+01 1.332000e+00 -6.246041e+01 1.554000e+00 -6.289192e+01 1.776000e+00 -6.548097e+01 1.998000e+00 -6.591247e+01 2.220000e+00 -6.763850e+01 2.442000e+00 -7.238508e+01 2.664000e+00 -7.195358e+01 2.886000e+00 4.954787e+02 3.108000e+00 2.687104e+03 3.330000e+00 4.489078e+03 3.552000e+00 6.102055e+03 3.774000e+00 7.009084e+03 3.996000e+00 6.729465e+03 4.218000e+00 7.354288e+03 4.440000e+00 8.421838e+03 4.662000e+00 9.476874e+03 4.884000e+00 1.042705e+04 5.106000e+00 1.126720e+04 5.328000e+00 1.199946e+04 5.550000e+00 1.264025e+04 5.772000e+00 1.320380e+04 5.994000e+00 1.370176e+04 6.216000e+00 1.413586e+04 6.438000e+00 1.452637e+04 6.660000e+00 1.487503e+04 6.882000e+00 1.518183e+04 7.104000e+00 1.545196e+04 7.326000e+00 1.570525e+04 7.548000e+00 1.593395e+04 7.770000e+00 1.613892e+04 7.992000e+00 1.632878e+04 8.214000e+00 1.650311e+04 8.436000e+00 1.666104e+04 8.658000e+00 1.680646e+04 8.880000e+00 1.694109e+04 9.102000e+00 1.706666e+04 9.324000e+00 1.718273e+04 9.546000e+00 1.728802e+04 9.768000e+00 1.738640e+04 9.990000e+00 1.747918e+04 1.021200e+01 1.756634e+04 1.043400e+01 1.764617e+04 1.065600e+01 1.772039e+04 1.087800e+01 1.779331e+04 1.110000e+01 1.785847e+04 1.132200e+01 1.791931e+04 1.154400e+01 1.797843e+04 1.176600e+01 1.803323e+04 1.198800e+01 1.808156e+04 1.221000e+01 1.813291e+04 1.243200e+01 1.817951e+04 1.265400e+01 1.822482e+04 1.287600e+01 1.826236e+04 1.309800e+01 1.830336e+04 1.332000e+01 1.834305e+04 1.354200e+01 1.837671e+04 1.376400e+01 1.841382e+04 1.398600e+01 1.844187e+04 1.420800e+01 1.847035e+04 1.443000e+01 1.849969e+04 1.465200e+01 1.852946e+04 1.487400e+01 1.855493e+04 1.509600e+01 1.857995e+04 1.531800e+01 1.860455e+04 1.554000e+01 1.862742e+04 1.576200e+01 1.865158e+04 1.598400e+01 1.867402e+04 1.620600e+01 1.869344e+04 1.642800e+01 1.871156e+04 1.665000e+01 1.873098e+04 1.687200e+01 1.874695e+04 1.709400e+01 1.876248e+04 1.731600e+01 1.877801e+04 1.753800e+01 1.879441e+04 1.776000e+01 1.880693e+04 1.798200e+01 1.882073e+04 1.820400e+01 1.883066e+04 1.842600e+01 1.884662e+04 1.864800e+01 1.885957e+04 1.887000e+01 1.887165e+04 1.909200e+01 1.888330e+04 1.931400e+01 1.889366e+04 1.953600e+01 1.890531e+04 1.975800e+01 1.891307e+04 1.998000e+01 1.892473e+04 2.020200e+01 1.892990e+04 2.042400e+01 1.894026e+04 2.064600e+01 1.895191e+04 2.086800e+01 1.895709e+04 2.109000e+01 1.896788e+04 2.131200e+01 1.897694e+04 2.153400e+01 1.898643e+04 2.175600e+01 1.899463e+04 2.197800e+01 1.900369e+04 2.220000e+01 1.901232e+04 2.242200e+01 1.902138e+04 2.264400e+01 1.902656e+04 2.286600e+01 1.903476e+04 2.308800e+01 1.904080e+04 2.331000e+01 1.904900e+04 2.353200e+01 1.905677e+04 2.375400e+01 1.906324e+04 2.397600e+01 1.907144e+04 2.419800e+01 1.907921e+04 2.442000e+01 1.908568e+04 2.464200e+01 1.909690e+04 2.486400e+01 1.910682e+04 2.508600e+01 1.910984e+04 2.530800e+01 1.911675e+04 2.553000e+01 1.912538e+04 2.575200e+01 1.913314e+04 2.597400e+01 1.914048e+04 2.619600e+01 1.914825e+04 2.641800e+01 1.915644e+04 2.664000e+01 1.916594e+04 2.686200e+01 1.917198e+04 2.708400e+01 1.917931e+04 2.730600e+01 1.919054e+04 2.752800e+01 1.919528e+04 2.775000e+01 1.920262e+04 2.797200e+01 1.921082e+04 2.819400e+01 1.921902e+04 2.841600e+01 1.923282e+04 2.863800e+01 1.923584e+04 2.886000e+01 1.924145e+04 2.908200e+01 1.924663e+04 2.930400e+01 1.925612e+04 2.952600e+01 1.926087e+04 2.974800e+01 1.926864e+04 2.997000e+01 1.927468e+04 3.019200e+01 1.928244e+04 3.041400e+01 1.928892e+04 3.063600e+01 1.929410e+04 3.085800e+01 1.930100e+04 3.108000e+01 1.930704e+04 3.130200e+01 1.930920e+04 3.152400e+01 1.931567e+04 3.174600e+01 1.931524e+04 3.196800e+01 1.932387e+04 3.219000e+01 1.932862e+04 3.241200e+01 1.933509e+04 3.263400e+01 1.933768e+04 3.285600e+01 1.933940e+04 3.307800e+01 1.934372e+04 3.330000e+01 1.934760e+04 3.352200e+01 1.935321e+04 3.374400e+01 1.935408e+04 3.396600e+01 1.936184e+04 3.418800e+01 1.936486e+04 3.441000e+01 1.937090e+04 3.463200e+01 1.937694e+04 3.485400e+01 1.937953e+04 3.507600e+01 1.938169e+04 3.529800e+01 1.938860e+04 3.552000e+01 1.938989e+04 3.574200e+01 1.939464e+04 3.596400e+01 1.940284e+04 3.618600e+01 1.940888e+04 3.640800e+01 1.941276e+04 3.663000e+01 1.941621e+04 3.685200e+01 1.941880e+04 3.707400e+01 1.942614e+04 3.729600e+01 1.943132e+04 3.751800e+01 1.943649e+04 3.774000e+01 1.943865e+04 3.796200e+01 1.944340e+04 3.818400e+01 1.945073e+04 3.840600e+01 1.945764e+04 3.862800e+01 1.946195e+04 3.885000e+01 1.946411e+04 3.907200e+01 1.947015e+04 3.929400e+01 1.947403e+04 3.951600e+01 1.948094e+04 3.973800e+01 1.948698e+04 3.996000e+01 1.949302e+04 4.018200e+01 1.950165e+04 4.040400e+01 1.951028e+04 4.062600e+01 1.951589e+04 4.084800e+01 1.952452e+04 4.107000e+01 1.953488e+04 4.129200e+01 1.954523e+04 4.151400e+01 1.955429e+04 4.173600e+01 1.956681e+04 4.195800e+01 1.957414e+04 4.218000e+01 1.957803e+04 4.240200e+01 1.958493e+04 4.262400e+01 1.959572e+04 4.284600e+01 1.960263e+04 4.306800e+01 1.960737e+04 4.329000e+01 1.961687e+04 4.351200e+01 1.961773e+04 4.373400e+01 1.962593e+04 4.395600e+01 1.963283e+04 4.417800e+01 1.963628e+04 4.440000e+01 1.964318e+04 4.462200e+01 1.964923e+04 4.484400e+01 1.965225e+04 4.506600e+01 1.965441e+04 4.528800e+01 1.965915e+04 4.551000e+01 1.966821e+04 4.573200e+01 1.966908e+04 4.595400e+01 1.967382e+04 4.617600e+01 1.967900e+04 4.639800e+01 1.967900e+04 4.662000e+01 1.968116e+04 4.684200e+01 1.967814e+04 4.706400e+01 1.968461e+04 4.728600e+01 1.968634e+04 4.750800e+01 1.968806e+04 4.773000e+01 1.969195e+04 4.795200e+01 1.969583e+04 4.817400e+01 1.969410e+04 4.839600e+01 1.969410e+04 4.861800e+01 1.969238e+04 4.884000e+01 1.968979e+04 4.906200e+01 1.969065e+04 4.928400e+01 1.969324e+04 4.950600e+01 1.969367e+04 4.972800e+01 1.969496e+04 4.995000e+01 1.969799e+04 5.017200e+01 1.969842e+04 5.039400e+01 1.969367e+04 5.061600e+01 1.969367e+04 5.083800e+01 1.969971e+04 5.106000e+01 1.969756e+04 5.128200e+01 1.969496e+04 5.150400e+01 1.969195e+04 5.172600e+01 1.969281e+04 5.194800e+01 1.968893e+04 5.217000e+01 1.968849e+04 5.239200e+01 1.968332e+04 5.261400e+01 1.968677e+04 5.283600e+01 1.968763e+04 5.305800e+01 1.968634e+04 5.328000e+01 1.968547e+04 5.350200e+01 1.968375e+04 5.372400e+01 1.968159e+04 5.394600e+01 1.967771e+04 5.416800e+01 1.967555e+04 5.439000e+01 1.967425e+04 5.461200e+01 1.967253e+04 5.483400e+01 1.967469e+04 5.505600e+01 1.967339e+04 5.527800e+01 1.966951e+04 5.550000e+01 1.966605e+04 5.572200e+01 1.966433e+04 5.594400e+01 1.966045e+04 5.616600e+01 1.966260e+04 5.638800e+01 1.965915e+04 5.661000e+01 1.965311e+04 5.683200e+01 1.965527e+04 5.705400e+01 1.965354e+04 5.727600e+01 1.965311e+04 5.749800e+01 1.965095e+04 5.772000e+01 1.965182e+04 5.794200e+01 1.965138e+04 5.816400e+01 1.964793e+04 5.838600e+01 1.964491e+04 5.860800e+01 1.964491e+04 5.883000e+01 1.964578e+04 5.905200e+01 1.964448e+04 5.927400e+01 1.964275e+04 5.949600e+01 1.963973e+04 5.971800e+01 1.963499e+04 5.994000e+01 1.963585e+04 6.016200e+01 1.963499e+04 6.038400e+01 1.963240e+04 6.060600e+01 1.962894e+04 6.082800e+01 1.962549e+04 6.105000e+01 1.962679e+04 6.127200e+01 1.962506e+04 6.149400e+01 1.962506e+04 6.171600e+01 1.962247e+04 6.193800e+01 1.961859e+04 6.216000e+01 1.961773e+04 6.238200e+01 1.961384e+04 6.260400e+01 1.960910e+04 6.282600e+01 1.960953e+04 6.304800e+01 1.960953e+04 6.327000e+01 1.961082e+04 6.349200e+01 1.939593e+04 6.371400e+01 1.808329e+04 6.393600e+01 1.648067e+04 6.415800e+01 1.494105e+04 6.438000e+01 1.355117e+04 6.460200e+01 1.230972e+04 6.482400e+01 1.121412e+04 6.504600e+01 1.024841e+04 6.526800e+01 9.393591e+03 6.549000e+01 8.633274e+03 6.571200e+01 7.974796e+03 6.593400e+01 7.371547e+03 6.615600e+01 6.828281e+03 6.637800e+01 6.337226e+03 6.660000e+01 5.897517e+03 6.682200e+01 5.498806e+03 6.704400e+01 5.136339e+03 6.726600e+01 4.805375e+03 6.748800e+01 4.499868e+03 6.771000e+01 4.221112e+03 6.793200e+01 3.974292e+03 6.815400e+01 3.739982e+03 6.837600e+01 3.519914e+03 6.859800e+01 3.321852e+03 6.882000e+01 3.133715e+03 6.904200e+01 2.964995e+03 6.926400e+01 2.801454e+03 6.948600e+01 2.652152e+03 6.970800e+01 2.512776e+03 6.993000e+01 2.378577e+03 7.015200e+01 2.253440e+03 7.037400e+01 2.136501e+03 7.059600e+01 2.028624e+03 7.081800e+01 1.928946e+03 7.104000e+01 1.832720e+03 7.126200e+01 1.743398e+03 7.148400e+01 1.657097e+03 7.170600e+01 1.577699e+03 7.192800e+01 1.499596e+03 7.215000e+01 1.425377e+03 7.237200e+01 1.355473e+03 7.259400e+01 1.289884e+03 7.281600e+01 1.225589e+03 7.303800e+01 1.168198e+03 7.326000e+01 1.109514e+03 7.348200e+01 1.056438e+03 7.370400e+01 1.004657e+03 7.392600e+01 9.558970e+02 7.414800e+01 9.075680e+02 7.437000e+01 8.670066e+02 7.459200e+01 8.273077e+02 7.481400e+01 7.858830e+02 7.503600e+01 7.453212e+02 7.525800e+01 7.095064e+02 7.548000e+01 6.741226e+02 7.570200e+01 6.357186e+02 7.592400e+01 6.046499e+02 7.614600e+01 5.714239e+02 7.636800e+01 5.416497e+02 7.659000e+01 5.136017e+02 7.681200e+01 4.842593e+02 7.703400e+01 4.588006e+02 7.725600e+01 4.294578e+02 7.747800e+01 4.044306e+02 7.770000e+01 3.837180e+02 7.792200e+01 3.595537e+02 7.814400e+01 3.336634e+02 7.836600e+01 3.133824e+02 7.858800e+01 2.931016e+02 7.881000e+01 2.710948e+02 7.903200e+01 2.525400e+02 7.925400e+01 2.374372e+02 7.947600e+01 2.188824e+02 7.969800e+01 2.029166e+02 7.992000e+01 1.878138e+02 8.014200e+01 1.705536e+02 8.036400e+01 1.524302e+02 8.058600e+01 1.360330e+02 8.080800e+01 1.248138e+02 8.103000e+01 1.114371e+02 8.125200e+01 9.547126e+01 8.147400e+01 8.468358e+01 8.169600e+01 7.346440e+01 8.191800e+01 6.353974e+01 8.214000e+01 5.102603e+01 8.236200e+01 3.980684e+01 8.258400e+01 3.074517e+01 8.280600e+01 2.082051e+01 8.302800e+01 9.601328e+00 8.325000e+01 -7.548738e-01 8.347200e+01 -1.067953e+01 8.369400e+01 -1.801516e+01 8.391600e+01 -2.837134e+01 8.413800e+01 -3.786450e+01 8.436000e+01 -4.822067e+01 8.458200e+01 -5.383027e+01 8.480400e+01 -5.900836e+01 8.502600e+01 -6.893303e+01 8.524800e+01 -7.756317e+01 8.547000e+01 -8.446729e+01 8.569200e+01 -9.180291e+01 8.591400e+01 -9.870705e+01 8.613600e+01 -1.051797e+02 8.635800e+01 -1.146728e+02 8.658000e+01 -1.220084e+02 8.680200e+01 -1.315016e+02 8.702400e+01 -1.366797e+02 8.724600e+01 -1.444468e+02 8.746800e+01 -1.504879e+02 8.769000e+01 -1.586866e+02 8.791200e+01 -1.582551e+02 8.813400e+01 -1.647277e+02 8.835600e+01 -1.668852e+02 8.857800e+01 -1.729263e+02 8.880000e+01 -1.776729e+02 8.902200e+01 -1.863030e+02 8.924400e+01 -1.875975e+02 8.946600e+01 -1.914811e+02 8.968800e+01 -1.919126e+02 8.991000e+01 -1.970907e+02 9.013200e+01 -1.979537e+02 9.035400e+01 -2.074469e+02 9.057600e+01 -2.070154e+02 9.079800e+01 -2.065839e+02 9.102000e+01 -2.096044e+02 9.124200e+01 -2.165085e+02 9.146400e+01 -2.186661e+02 9.168600e+01 -2.234127e+02 9.190800e+01 -2.242757e+02 9.213000e+01 -2.311798e+02 9.235200e+01 -2.311798e+02 9.257400e+01 -2.307483e+02 9.279600e+01 -2.324743e+02 9.301800e+01 -2.354949e+02 9.324000e+01 -2.367894e+02 9.346200e+01 -2.428305e+02 9.368400e+01 -2.428305e+02 9.390600e+01 -2.480086e+02 9.412800e+01 -2.484401e+02 9.435000e+01 -2.497346e+02 9.457200e+01 -2.514606e+02 9.479400e+01 -2.540497e+02 9.501600e+01 -2.583647e+02 9.523800e+01 -2.618168e+02 9.546000e+01 -2.639743e+02 9.568200e+01 -2.652689e+02 9.590400e+01 -2.652689e+02 9.612600e+01 -2.682894e+02 9.634800e+01 -2.687209e+02 9.657000e+01 -2.682894e+02 9.679200e+01 -2.730360e+02 9.701400e+01 -2.738990e+02 9.723600e+01 -2.743305e+02 9.745800e+01 -2.726045e+02 9.768000e+01 -2.743305e+02 9.790200e+01 -2.756250e+02 9.812400e+01 -2.786456e+02 9.834600e+01 -2.790771e+02 9.856800e+01 -2.829607e+02 9.879000e+01 -2.808031e+02 9.901200e+01 -2.833922e+02 9.923400e+01 -2.842552e+02 9.945600e+01 -2.902963e+02 9.967800e+01 -2.907278e+02 9.990000e+01 -2.907278e+02 1.001220e+02 -2.924538e+02 1.003440e+02 -2.937483e+02 1.005660e+02 -2.933169e+02 1.007880e+02 -2.937483e+02 1.010100e+02 -2.937483e+02 1.012320e+02 -2.928854e+02 1.014540e+02 -2.937483e+02 1.016760e+02 -2.941798e+02 1.018980e+02 -2.946114e+02 1.021200e+02 -2.954744e+02 1.023420e+02 -2.967689e+02 1.025640e+02 -2.950429e+02 1.027860e+02 -2.967689e+02 1.030080e+02 -2.937483e+02 1.032300e+02 -2.993580e+02 1.034520e+02 -2.980634e+02 1.036740e+02 -3.015155e+02 1.038960e+02 -2.980634e+02 1.041180e+02 -3.002209e+02 1.043400e+02 -3.019470e+02 1.045620e+02 -3.015155e+02 1.047840e+02 -3.023785e+02 1.050060e+02 -3.032415e+02 1.052280e+02 -3.028100e+02 1.054500e+02 -3.036730e+02 1.056720e+02 -3.023785e+02 1.058940e+02 -3.079881e+02 1.061160e+02 -3.088511e+02 1.063380e+02 -3.097141e+02 1.065600e+02 -3.097141e+02 1.067820e+02 -3.084196e+02 1.070040e+02 -3.088511e+02 1.072260e+02 -3.105772e+02 1.074480e+02 -3.105772e+02 1.076700e+02 -3.110087e+02 1.078920e+02 -3.118717e+02 1.081140e+02 -3.105772e+02 1.083360e+02 -3.092826e+02 1.085580e+02 -3.118717e+02 1.087800e+02 -3.183443e+02 1.090020e+02 -3.187758e+02 1.092240e+02 -3.183443e+02 1.094460e+02 -3.183443e+02 1.096680e+02 -3.209333e+02 1.098900e+02 -3.209333e+02 1.101120e+02 -3.209333e+02 1.103340e+02 -3.213648e+02 1.105560e+02 -3.209333e+02 1.107780e+02 -3.209333e+02

Note: i don´t use an equation!

  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
static temperature and total temperature showwa FLUENT 3 March 24, 2016 06:58
Different patch type specifications for velocity and temperature ankgupta8um OpenFOAM Running, Solving & CFD 5 December 31, 2010 11:57
Finding velocity temperature etc at a particular pt in space srinath OpenFOAM Running, Solving & CFD 5 January 6, 2009 08:30
effect of difference in temperature on velocity sravani CFX 2 October 2, 2007 02:41
transient temperature field with constant velocity Törnquist CFX 0 September 16, 2003 05:22


All times are GMT -4. The time now is 14:47.