pezarello86
Guest
Hello everyone,
I would like to share with you a problem that I have using cfx for salt water dispersion in fresh water.
the model is rectangular in shape inside which are placed poles that have the function of structures for the discharge of salt water.
the model has a speed inlet and a pressure outlet on the opposite side and a fresh water input speed at 0.1 m/s (seal a sea current); on the poles we have two drains (the number of these does not affect the problem I have found) that throw salt water in the direction perpendicular to the current. the purpose of the analysis is to evaluate the dispersion of this salt water that emerges from the discharges. to evaluate it I set the following:
- activate gravity (and therefore buoyancy);
- a reference pressure of 1 atm at the highest point of the model (it would be the sea level);
- the same thing I did in the advanced options of solver control;
- density reference of 0.
Unfortunately in these settings give as a result an incorrect pressure swing but a motion field that seems almost correct apart a recirculation on the outlet (which I do not explain, is not connected to the size of the model because the outlet is positioned quite downstream). if instead I try to vary the reference density, 998 or 100 kg/m3, the hydrostatic vessel returns well but the motion field goes to be blessed (it is as if the higher near the bottom pushed the fluid upwards).
Does anyone have any suggestions?
thanks to all in advance
Giuseppe
I would like to share with you a problem that I have using cfx for salt water dispersion in fresh water.
the model is rectangular in shape inside which are placed poles that have the function of structures for the discharge of salt water.
the model has a speed inlet and a pressure outlet on the opposite side and a fresh water input speed at 0.1 m/s (seal a sea current); on the poles we have two drains (the number of these does not affect the problem I have found) that throw salt water in the direction perpendicular to the current. the purpose of the analysis is to evaluate the dispersion of this salt water that emerges from the discharges. to evaluate it I set the following:
- activate gravity (and therefore buoyancy);
- a reference pressure of 1 atm at the highest point of the model (it would be the sea level);
- the same thing I did in the advanced options of solver control;
- density reference of 0.
Unfortunately in these settings give as a result an incorrect pressure swing but a motion field that seems almost correct apart a recirculation on the outlet (which I do not explain, is not connected to the size of the model because the outlet is positioned quite downstream). if instead I try to vary the reference density, 998 or 100 kg/m3, the hydrostatic vessel returns well but the motion field goes to be blessed (it is as if the higher near the bottom pushed the fluid upwards).
Does anyone have any suggestions?
thanks to all in advance
Giuseppe