[hydraulist]

Hello,
My apologies for initially posting this question in Main CFD forum, which i could not redirect to OpenFoam forum.

I'm trying to have a sinusoidal initial liquid free surface in Sloshing tank problems. Presently i'm using setFields with boxToCell function to create a flat liquid surface. While checking for setting different initial free surface conditions, i came to know about swak4Foam application which i could install. I'm using OF2.3.1.
I could not understand what "constant-value surfaceField" is, produced by "surf" function, which is explained in "https://openfoamwiki.net/index.php/Contrib_funkySetFields"
I want to have an expression a*cos(k*x) ( where a-amplitude of wave, k-wave number, x-variable along the length of tank), for the liquid free surface at time=0.
Kindly help me to do this.
Thank you.

[hydraulist]

Hi,
I tried with the following command line expression for a linear slope free surface which worked correctly.

funkySetFields -time 0 -field alpha.water -expression "faceAverage(fpos().y <= surf(0.2)*fpos().x+surf(0.5) ? surf(1.0) : surf(0.))"

But while trying with,

funkySetFields -time 0 -field alpha.water -expression "faceAverage(fpos().y <= surf(0.2)*sin(fpos().x) ? surf(1.0) : surf(0.))"

I'm getting the following error message,
"
Create time

fileName::stripInvalid() called for invalid fileName funkysetfieldsine~
For debug level (= 2) > 1 this is considered fatal
Aborted (core dumped)
"
Please correct me to have sinusoidal initial liquid surface.
I saw some old threads related to free surface, but the conversations were not complete.

[atafiroozi]

you have a file with spaces in its name inside the directory and OpenFOAM commands do not run while those are existing.
it seems like in your case, there is a file named sth like "funkysetfieldsine~" but with spaces ofc...
In general, try to avoid including spaces while naming files in Linux. Use underscores or hyphens instead.