Visualizing Water Currents in Liquid Pools Using Ansys Discovery

Visualizing Water Currents in Liquid Pools Using Ansys Discovery Hello, everybody. In today's presentation, we want to showcase some of the powers of Discovery Simulation. It's a tool to clean up the geometry and prepare the geometry for CFD analysis or mechanical analysis.

But Discovery in itself also has a solver which can be used to do basic CFD analysis and mechanical or electromagnetic analysis. In today's video, we will look into how Discovery can be used to run fluid flow simulation in a commercial swimming pool.

The commercial swimming pool is a setup where you have the traditional pool area and a small section typically called a lazy river.

The idea is that the liquid will be recirculating in the main region and there will be a certain stream of liquid which will form and move across in this region, preferably at a little higher speed, leading to the formation of a river system within the pool.

We will see how we can set up such a case in Discovery. The pool geometry is generated within Discovery. It has a top surface named the free surface, internal walls, and the bottom part. There is one inlet stream, a second inlet stream named large inlet, and three outlets at the bottom.

Using this boundary condition, we want to simulate the flow within this pool by varying the geometry of the pool and the flow rate from these inputs. We want to see how the fluid flow or the flow vectors are affected and how the flow direction changes within the pool.

In explore mode, we will click on the fluid flow simulation and set up the inlet boundaries. We will set up the velocity for 0.25 meters per second for both inlets. We will set up the outlet as 0 pascal. We will set up the top surface as a free slip condition.

The other walls are automatically selected as a no slip wall boundary condition. With the material already selected to be water, we can now run the analysis. We can see how the vectors look like and how the flow distribution is changing within the system.

We can change the design by adding a secondary inlet or changing the value of the inlet. We can also change the orientation of the geometry using the move tool. We can use particles to check how the flow will look like in a different manner.

We can also create section planes to see how the flow is different at different locations. Next, we will add gravity to the system to solve for natural circulation. We will set the fluid temperature to 22 degrees centigrade and add convective heat transfer to the walls.

We will have flow coming in at different temperatures and velocities. The whole pool is losing heat at a rate of 10 watt per meter square degrees centigrade. The convective heat transfer is set to 22 degrees centigrade, the ambient temperature.

Based on this analysis, we can look at the final solution of what the average pool temperature will be under such a condition. We can change the dimensions in this pool and see how changing various dimensions will affect the flow distribution and temperature distribution.

Using these simulations, we can see how many different variations we could run through in a very short amount of time. Discovery simulations provide a very good understanding of the flow physics that is going on.

If we want to run more detailed analysis, we will eventually have to move this model into ANSYS Fluent or CFX to run these kind of multi-phase models. In this model, if we want to run parametric analysis, we can set up the parametric analysis.

We can create defined parameters using a generator which is already embedded within Discovery. We can run select update all to go through each one of the final results and choose the best option.

Once the results are ready, we can also look at the final parameter variation results in terms of graph, where we can change the input conditions. With this, I would like to conclude this presentation. If you are interested in such kind of simulation, feel free to go to our website and contact us.

Thank you very much.