Original subtitles

Hello everybody and welcome to a new section in this section.

We're going to be looking at the Domain and how it changes how the simulation looks to get started.

Let's go ahead and create a small scene for example with this cube selected.

I'm going to press us to scale and then I'll drag it up.

This is going to be our domain for this demonstration next I'll add in a mesh and then a cube and they'll

present and go into wireframe.

This is going to be our flow object.

So I'm going to move it up along the z axis and then also like the domain and go over to the physics

tab.

If I select fluid I can see there is a type option here there are three different types domain flow

and effector in this video we'll be looking at the Domain.

So let's go ahead and select that in the domain type.

It's currently set to gas which would be fire and smoke since we're dealing with liquid.

We need to change it over to the liquid simulation.

And as you can see there is quite a lot of different settings over here to go through.

Don't worry we'll go through each one and you'll learn exactly what they do.

Let's first start out with the top settings up here.

We have the domain type which we already looked at.

Gas is for fire and smoke and liquid is for the fluid simulation.

The resolution division's controls how good the simulation will look.

The higher you set this to the better it will look but the longer it will take to bake you can go lower

all the way to a value of 24 and this will look really really low poly.

I find that a value of about 256 gives us a really really nice high rez simulation.

For now though we will just leave it at 60 for the time scale controls how fast the simulation will

look.

As you can see on screen there is two different simulations one is a time scale of point five and one

is a time scale of one I've noticed while testing around with the time scale that a value of one the

default value looks really fast for a realistic simulation.

I would probably set the timescale to a value of about point five or point six underneath that we have

the CFL number.

This is a little bit confusing but how this works is it deals with time steps the higher you set this

to the more time steps it will skip.

And what this will do is it will speed up your baking time.

But the simulation won't look as realistic.

The lower you go the more time steps will be in the simulation but the longer it will take to bake use

adaptive time steps allows you to set how many times sets will be per frame and it will automatically

calculate it.

We have a maximum and a minimum value.

The higher you set this to the better the simulation will look.

But again the longer it will take to bake if you have a simulation where there is a lot of fluid that's

really jittery or it just doesn't look as good or it's passing through an object try turning up the

time steps in that will fix your issue and then underneath that we have the gravity.

Currently it's great out and that is because we need to jump over to the settings over here in the scene

settings and turn off gravity in the world settings.

Once we do that we can jump back over to the simulation and we can see here and now we can set these

settings over in the scene panel that Z is at a negative nine point eight and if you wanted to do that

same number you would set that for the z axis here or if you wanted to play around that you can set

the x axis to a positive number.

And what this will do is it will make the gravity go in the x direction.

Same thing goes for the z axis.

If I would set this up to a value of 10 instead of falling down it would go straight up and land on

the ceiling.

The last thing that we have here is the border collisions.

If these are turned on the fluid will collide with the sides of the domain.

We can also turn them off.

This will give an illusion of the fluid just disappearing off into the distance of the domain.

So there you go that is the basic settings of the domain and in the next video we will take a look at

the liquid particles.