How to measure the position of the free surface?
Hello, good afternoon.
We are simulating several laboratory tests with Star CCM+ (tests carried out in a wave tank), in order to compare the results of the physical model with numerical model, we must to take measurements of free surface position (free surface elevation in z axis) along different points.
How is the manner to record this data (a probe, a point), creating another derived part?
I hope this information is enough, if you need more details, please contact me.
Thank´s for your attention.
You can create a Point Probe or a Plane Probe as is necessary and generate a report to check your results
NB: a point or line probe is not the answer in this case. Here is what to do:
1. Create an iso-surface at VOF=0.5
2. Create a vertical plane section at the x location but with the iso-surface as the input part. The resulting section is then a line at the intersection of the isos and the plane
3. Create another vertical plane section at the required y location and use the above line section as the part.
Now that section is actually a point at the intersection of those three parts - since one of them is the water height it will move up and down during solution.
4. Create a Max report with field function Position - ie z and the point section as the part.
5. Create a monitor and plot of this report - DONE.
Hello, good morning from Spain,
Thank´s for your prompt reply.
We have found another proccedure for measuring the position of free surface, is the following method:
1.- Create a vertical plane section normal to wave advancing direction.
2.- Create a report to measure the Area Averaged at this section.
3.- Set at this report Volume Fraction of Water as Scalar field function.
4.- Create a monitor and a plot from this report.
5.- The values you will obtain are the percentage of water you have at this section, in another words, the water level time series at this point.
Yes this is also a good method which I use when I require the hgt averaged across a plane (and if you want it in just say a 1m wide plane then define a constrained plane).
However you requested the level at 'points' rather than planes so this is the method I suggested - eg to track the bow wave development from a boat hull - very three dimensional.
how can i create a surface elevation plot for the free surface?
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