Learning Forum

[Zwernjayden]

I need help modeling the stress a nozzle experiences at high temps. I know my stagnation pressure and temp but need to know the max stress in the nozzle. I assume it's transient but how would I model this. Would I use fluent? Or transient heat+structural?

[CFD_Friend]

Hi Jayden,

If you know the flow characteristics at the nozzle's inlet and outlet, you can easily model this in Fluent. 

Let me know what you are trying to find out from the simulation. 

[Zwernjayden]

Im basically trying to find the stress in the nozzle because it broke 

[Ashish Khemka]

Hi,

If you have the data for pressure variation with location x,y, z and time and also the data for variation of temperature with location and time then you can use External Data module to imprt this data in Transient Structural Analysis and see the stress generated on the nozzle. In addition, do you have the stress-strain graph for nozzle? If yes then you may try using a material model like Multilinea Kinematic Hardening for say a steel nozzle.

 

Regards,

Ashish Khemka

[Zwernjayden]

I only have the chamber pressure, and hypothetical chamber temp

[Ashish Khemka]

Hi,

Please see if the YouTube video titled ' ANSYS: Rocket Nozzle FSI (coupled Thermal Structural) & Harmonic Analysis Tutorial' helps.

Regards,

Ashish Khemka