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February 18, 2011, 10:17 |
A fatal signal (segmentation violation)
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#1 |
New Member
sutthinan
Join Date: Feb 2011
Posts: 9
Rep Power: 15 |
Hi everyone,
I need to control the geometry of boundary in function of pressure in fluent by using the UDF in deform function, but fluent show massage that "A fatal signal (segmentation violation)", I really don't know about this error, this is my UDF #include "udf.h" DEFINE_GEOM(deform, domain, dt, position) { Thread *t; face_t f; real x[ND_ND]; real NV_VEC (A); real ho=0.000001, hc, def; real presur[1000],xx[1000]; int max; int i,j; if (!Data_Valid_P ()) return; i=0.; begin_f_loop (f, t) { F_CENTROID(x,f,t); xx[i]=x[0]; presur[i]=F_P(f, t); i=i+1; max=i; } end_f_loop (f, t) i=0.; j=0.; begin_f_loop (f, t) { for(i = 0; i < max;i++) { def=(xx[j+1]-xx[j])*presur[j]*ln(fabs((xx[i+1]+xx[i])/2.-xx[j]*fabs((xx[i-1]+xx[i])/2.-xx[j])); } hc=def/(2.*3.14); position[1]=ho+xx[j]*xx[j]/2.+hc; j=j+1; } end_f_loop (f, t) return position[1]; } Many thanks |
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February 18, 2011, 11:07 |
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#2 |
Senior Member
Join Date: Nov 2009
Posts: 411
Rep Power: 20 |
Probably your vectors are smaller than the total number of faces from your mesh. Do a grid->check to see how many faces do you have and let me know.
Do |
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February 18, 2011, 18:57 |
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#3 |
New Member
sutthinan
Join Date: Feb 2011
Posts: 9
Rep Power: 15 |
Hi Dohander,
My gird has the data as following; Level Cells Faces Nodes Partitions 0 64902 98278 33377 1 1 cell zone, 6 face zones. Thanks you so much for your suggestion. Sutthinan |
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February 18, 2011, 20:45 |
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#4 |
Senior Member
Join Date: Nov 2009
Posts: 411
Rep Power: 20 |
OK,
Check if the total numbers of faces (not zones) is less than 1000. I think this is why you have the memory error, specifically here: real presur[1000],xx[1000]; |
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February 19, 2011, 02:57 |
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#5 |
New Member
sutthinan
Join Date: Feb 2011
Posts: 9
Rep Power: 15 |
Thank you for your advices, and I wonder that if I need to use the presure for calculating. Does which one appropriate between C_P(c,t) and F_P(f, t) ? (because both of them, I can get the same pressure)
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February 19, 2011, 11:23 |
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#6 |
Senior Member
Join Date: Nov 2009
Posts: 411
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One is for the pressure at the center of a cell and one for the pressure at a face of a cell.
Try changing this line: real presur[1000],xx[1000]; to real presur[98280],xx[98280]; It should get rid of the memory violation error, at least I hope so. Do |
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March 16, 2011, 19:35 |
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#7 | |
New Member
Chun-Liang Wu
Join Date: May 2010
Posts: 2
Rep Power: 0 |
what is the face thread t in the face loop? The pointer t is not initialized or assigned a valid value, which absolutely returns you a "segmentation fault" error.
Quote:
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