
[Sponsors] 
September 10, 2020, 09:13 
Calculate Force over beam

#1 
Member
Join Date: Jan 2020
Posts: 31
Rep Power: 6 
Hi, I am trying to calculate the force on the beam! the formula is like this:
L is the length of the beam. and I am using this code(part of the code) in DEFINE_EXECUTE_AT_END macro: Domain *d= Get_Domain(1); Thread *t=Lookup_Thread(d,ID); face_t f; begin_f_loop(f, t) if (PRINCIPAL_FACE_P(f,t)) { F_CENTROID(x,f,t); yy = x[0]; F_AREA(area,f,t); phi = 1cos((PI/2)*(yy/L)); Fpy+=L*area[1]*F_P(f,t)*phi; } fout = fopen ("Pressure.out","a"); fprintf(fout," %f %f %f %f %f %f %f\n",time,area[1],Fpy,F_P(f,t),phi); fclose(fout); end_f_loop(f, t) Fy = Fpy; #if RP_NODE /* SERIAL or NODE */ Fy=PRF_GRSUM1(Fy); #endif /* RP_NODE */ Is this true?! should I multiply (L) for calculating Force (Fpy+=L*area[1]*F_P(f,t)*phi) THANKS 

September 15, 2020, 05:00 

#2 
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 
unfortunately, I don't see any formula, may be, cause the picture is blocked.
I have no Idea, if you need L (length of the beam) in the formula or not, so I can comment the code only most likely you have problems in writing to file Code:
fout = fopen ("Pressure.out","a"); fprintf(fout," %f %f %f %f %f %f %f\n",time,area[1],Fpy,F_P(f,t),phi); fclose(fout); Read Ansys Fluent Customization manual for detailed information. Look for parallelization chapter if you remove that part, I think, code should work well
__________________
best regards ****************************** press LIKE if this message was helpful 

September 16, 2020, 08:24 

#3  
Member
Join Date: Jan 2020
Posts: 31
Rep Power: 6 
Quote:
here is my question: should I multiply (L) for calculating Force or not?!(Fpy+=L*area[1]*F_P(f,t)*phi) and for more details I use the series form when I open fluent not parallel 

Tags 
beam, blade, piezoelectric, udf 
Thread Tools  Search this Thread 
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Drag Force Ratio for Flat Plate  Rob Wilk  Main CFD Forum  40  May 10, 2020 04:47 
how to calculate the drag force on a 3D sphere in OF?  keepfit  OpenFOAM  2  May 6, 2015 12:04 
how to calculate force with dynamic pressure  T.Matrix  OpenFOAM PostProcessing  0  October 14, 2012 00:39 
How to calculate total force?  T.Matrix  OpenFOAM PostProcessing  2  October 14, 2012 00:15 
how does Fluent calculate the pressure and viscous force ?  e30.lsb  FLUENT  7  June 27, 2011 21:31 