Learning Forum

[pavankonchada123]

Dear Ansys Team

(rpgetvar 'dpm/lowest-mass) and (rpsetvar 'dpm/lowest-mass 1e-24) are not working in ansys 2022r2

 

Error: rp-var-value: undefined variable

Error Object: dpm/lowest-mass

[pavankonchada123]

The above commands are working in ansys 19.2 , Can anybody help me out with this

[Prashanth]

Hi 

I checked in 22R2. You can't use it as that RP command is not available. RP commands are mostly used for internal testing purposes and the changes are not documented. 

 

[pavankonchada123]

How to change the lowest mass of the dpm particle. Default value is 5*10^-28. But I want it to be 10^-50

[Prashanth]

Why do you want to decrease the min mass to such a lower value? Are you using any breakup models?

[pavankonchada123]

I am trying to model the nucleation of vapor which has critical radius near to 10^-14

[Rob]

It's changed. You may want to have a look in the TUI

/define/models/dpm/options

[pavankonchada123]

I didnot found any setting to change the default value of mass define/models/dpm/options , please can you help me 

[DrAmine]

 

For changing the lowest mass you require hidden flags. TUI alone is not enough.

 

[Rob]

Ah, you need to update to 2023R1    

/define/models/dpm/options set-minimum-particle-diameter

[pavankonchada123]

Hi Amine, Can you help me with hidden flags concept to set the least mass

in 2023r1 I cant find least mass /define/models/dpm/options 

[DrAmine]

I cannot help on that: as mentioned at least two times in this thread the flags are not meant to be exposed on this open forum. You can first assess that TUI way to define the minum particle diameter. You probably won't require that hidden flag for the mass in the newst versions. Just check if lowering the minimum diameter will help particle nucleation.