How to create expressions in Ansys CFX - Power law velocity inlet profile example

[@worawatsa-ngawong7651]

thanks, this helps me lot in Ansys epression. Keep doing great jobs :)

[@ClimateCFD]

Thanks, I appreciate that.

[@elbachirer-rachdaoui3227]

Great explication Mr thank u so much

[@ClimateCFD]

You're very welcome. Don't forget to like and subscribe as it helps the channel reach more people!

[@damyankadimitrova5308]

Thank You!

[@ClimateCFD]

You’re welcome. What case are you running?

[@asifmostafaanik5588]

Thanks for sharing a vital point. This will help me in modelling ABL. However how do you define surface roughness e.g. roughness in the Boundary named Ground? Is it in a same way?

[@ClimateCFD]

Think it is only set a smooth wall.

[@masif3804]

great work...Very helpful..... How can i impose travelling sinusoidal wave across the walls?

[@ClimateCFD]

Using an expression with a sine function I would assume.

[@yadfaruq5294]

thank you so much sir for this information please i have a question i hope u answer me soon, how i creat new anisotropic material by expression in cfx can tell me that sir or is there any way to creat anisotopic material? thank u

[@ClimateCFD]

Hi, sorry for the late response. Did you have any success finding this solution?

[@thatsound7057]

thanks for this informative video, I am trying to get thrust force at the end of nozzle, when I write massFlowAve()@ what should I wirte inside the parenthesis ? after @ I think I should write the location I guess

[@ClimateCFD]

Hi, Thanks for the feedback. I don't think anything needs to be in the brackets.

[@thatsound7057]

@@ClimateCFD Thank you for answering I found that masFlowAve is function and inside the parenthesis it should be the variable. It looks correct I believe.

[@kshitizrajoria1139]

My meshing looks like a square grid, and I'm trying to make a blade coater for a power-law fluid. So, I followed the same approach but I'm not able to the same as you did at 5:14.

[@Mercento]

Thank you! I have a function of viscosity that is temperature dependent, i think i can follow your steps BUT how do i call the Temperatures, so i can use it in my viscosity expression? In Fluent, it is C_T(c,t), but here, what is it? I couldn't find any documentation. I am at my wit's end. Really appreciate your help!

[@ClimateCFD]

Hi, I'm not really sure about Fluent, because that uses UDFs rather than CEL, which CFX uses.

[@Mercento]

@@ClimateCFD thx for ur reply! Yes i understand we use CEL, but like, when we want to call for temperature, how do we do that with CEL? Just T? So is T reserved to call temperature from the model? Do you happen to have documentation to list all the reserved variables?

[@ClimateCFD]

@@Mercento Temperature is called as Temperature. It should italicise if it is reserved. Right click in the white area when writing expressions to see the full list. Remember that you can use functions to obtain averages (either over the domain or on surfaces).

[@Mercento]

@@ClimateCFD Got it! Thanks for taking the time to answer me. All the best!

[@ClimateCFD]

@@Mercento You're very welcome. Good luck with your simulations.

[@Joao-vx7xb]

10:19

[@ClimateCFD]

Equation for the power law is here ☝️

[@amitraj6239]

fluidVF = if(y-0.0103[m],1,0)... Can anyone please explain what is mean of above expression?

[@ujjalmondal4469]

Sir can you please tell, how to insert log profile

[@ClimateCFD]

What have you tried so far?

[@ujjalmondal4469]

@@ClimateCFD I haven't tried yet, but I am trying to know the process to input the boundary condition as log profile instead of power law

[@josualorima1334]

I can't solve my simulation when using ICEM meshing, It returns a code 1 and also return code 2

[@ClimateCFD]

There should be more detail in the .out file. Return codes are notoriously vague.