[W.N.]

How to calculate the actual water level,mean velocity and the discharge in open channel in the region of high turbulence as hydraulic jump.
i can measure other regions water level by isosurface at w.v.f. Equal 0.5 , water velocity using expression areaavg(water superficial velocity)@isoclip.
When I used the same method in the interested region,it gave me wrong value.

[ghorrocks]

Can you show some images of what you are doing and why the result is wrong?

Also you can use functions like areaInt(volume fraction)@cross section plane to get the wet area of a cross section, and you should be able to get the surface height from that.

[W.N.]

Thank you sir,
There's the velocity vectors for some sections ,
Attachment 58118Attachment 58119Attachment 58120
The problem in vector 3 that is the one that gave me the wrong values .i think that is due to the reverse flow in this section as shown in the picture,But I don't know how to deal with it.

[ghorrocks]

The attachments did no t work. Have a look at the FAQ: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F

[W.N.]

IMG_1457.JPGIMG_1456.JPGIMG_1455.JPG

[ghorrocks]

I have no idea what those images are showing or what it means. You are going to have to explain what is going on.

[W.N.]

I'm trying to model a free surface,multi phase (water,air) open channel flow with an obstacle across the channel section. IMG_1458.jpg

[JuPa]

Originally Posted by W.N.

I'm trying to model a free surface,multi phase (water,air) open channel flow with an obstacle across the channel section. Attachment 58165

Referring to that image, which information do you need CFD to tell you?

[W.N.]

Water level,velocity and discharge in the shown region.