# FLuent doesn't take into account the udf's code

**Hello everyone**

**I would like to simulate a fluid flow over a flat plate under a body force by using UDF code.**

**My problem is that the result is like a model without body force. **

**Below, you find my approach.**

**1. Interpreted to UDF code.**

**2. Hooking **

**2.1**

** **

**2.2**

**2.3**

**2.4**

**2.5 My problem is the lack of ::libudf ( according to the UDF manual)**

**3. Models===> Discret phase on**

**4. cell Zone Condition**

**5. Boundary Conditions :**

**5.1 Inlet velocity: have I to do 1 m/s or udf ?**

**In fact, In UDF code I have just coded the body force without inlet velocity. UDF code: x=0 bforce=0**

** x!=0 bforce (i==0)= F(x,y)**

** bforce (i==1)=G(x,y)**

**Can I use 02 macros in one udf code ? : Body_Force and DPM_BC (Velocity inlet)**

**6. Solution Methodes**

**>>> Pressure-velocity coupling : simple (Without change)**

**7. Solution Controls (without change)**

**7. Solution Initialization **

**>> STANDARD INITIALIZATION**

**>>> COMPUTE FORM: ALL-ZONES**

**>>>> x-velocity 1 m/s**

**>>> Initialize**

**8. Run calculation : The programm doesn't take into account the udf code .(The result is same to model without udf) **

**thanks you**

## Comments

Hello everyoneI would like to simulate a fluid flow over a flat plate under a body force by using UDF code.My problem is that the result is like a model without body force.Below, you find my approach.1. Interpreted to UDF code.2. Hooking2.12.22.32.42.5 My problem is the lack of ::libudf ( according to the UDF manual)3. Models===> Discret phase on4. cell Zone Condition5. Boundary Conditions :5.1 Inlet velocity: have I to do 1 m/s or udf ?In fact, In UDF code I have just coded the body force without inlet velocity.

UDF code: x=0 bforce=0

x!=0 bforce (i==0)= F(x,y)bforce (i==1)=G(x,y)Can I use 02 macros in one udf code ? : Body_Force and DPM_BC (Velocity inlet)6. Solution Methodes>>> Pressure-velocity coupling : simple (Without change)7. Solution Controls (without change)7. Solution Initialization>> STANDARD INITIALIZATION>>> COMPUTE FORM: ALL-ZONES>>>> x-velocity 1 m/s>>> Initialize8. Run calculation : The programm doesn't take into account the udf code .(The result is same to model without udf)thanks you