cfd compilation error - LNK2019
 

The code below is my udf for simulating a gear pump which was taken from a youtube video:

for second gear,

#include "udf.h"

DEFINE_CG_MOTION(gear_2_new,dt,vel,omega,time,dtim e)
{


real t = CURRENT_TIME;
NV_S (vel, = , 0.0);
NV_S (omega, = , 0.0);
omega[2] = -60.0;


}

for first gear,

#include "udf.h"

DEFINE_CG_MOTION(gear_1_new,dt,vel,omega,time,dtim e)
{

real t = CURRENT_TIME;
NV_S (vel, = , 0.0);
NV_S (omega, = , 0.0);
omega[2] = 60.0;

}

This is the error message i recieve:
gearone.obj : error LNK2019: unresolved external symbol __imp__RP_Get_Float referenced in function _gear_1_new
geartwo.obj : error LNK2001: unresolved external symbol __imp__RP_Get_Float
C:\PROGRA~1\ANSYSI~1\v192\fluent\fluent19.2.0\mult iport\win64\mpi\shared\mport.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
C:\PROGRA~1\ANSYSI~1\v192\fluent\fluent19.2.0\win6 4\2d_node\fl_mpi1920.lib : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
libudf.dll : fatal error LNK1120: 1 unresolved externals

The weird thing about this is that this udf executed perfectly the previous day and today its throwing me this error. i use fluent 19.2 and Visual studio 2017 .

fixed it
 

The issue is fixed. i reinstalled visual basic studio 2017 and got the x86 version of the visual basic studio community 2017 instead of the x64 version. Hope it helps others.

Why did you need a UDF code?

i was trying to do a dynamic mesh with 2d gear pump setup.

I dont know which software you use for this analysis but I think its better to use discontinuous mesh instead of adaptive mesh with such a moving part analysis.

Attachment 86130
Attachment 86131

Ps: Thanks to Ahmet Kozanoglu for images

i am currently using Ansys Fluent. discontinuous mesh sounds interesting. which software do you recommend for doing the analysis using discontinuous mesh?

I prefer Cradle CFD especially moving part analysis. You can download student version of it. There is many tutorials inside to better understand how CFD analysis can perform.

https://www.mscsoftware.com/node/10211

Note: Cradle is 3D CFD software, 2D analysis may not allowed. But you can define symmetrical or periodic boundaries.

wow, thanks. i will try it using cradle.