FreeCAD - Mesh Regions for a Better Analysis |JOKO ENGINEERING|

in this video let's go over the benefits

and effects of meshing a region while

doing an analysis in free cab

this surprised me I learned that freecad

was able to do this it's a very very

event thing and it's very very useful I

will show some footage here hopefully

remember to edited of doing a quick

meshing analysis in SolidWorks this was

a video to help improve the performance

of SolidWorks and the findings are

meshes and meshing related processing is

really exponential in scale this should

not be a surprise and this should also

apply to freecad processing mesh is

going to be exponential no matter how

you slice it it doesn't matter if you're

in creo SolidWorks CATIA you know freak

adding anything will have an exponential

scale when processing you mesh that

means if I go to do a tight mesh in my

analysis I'm gonna take exponentially

more processing so if we can only

specify a specific region to mesh we can

save a whole lot of unnecessary

processing power and still get the

resolution we're looking for this is

particularly true for curved regions so

why don't we get started and I'm gonna

go do this from scratch so you can

follow along if you prefer and the part

design workbench on the XY plane I can

make a rectangle I can add and what my

background makes things kind of visible

so let me change it my preferences to

display colors color gradient apply and

we'll use the symmetric constraint to

make sure that we are centered here and

I'm going to use a shift H for a

horizontal dimension we're going to go

three inches wide shift V for a vertical

and two inches tall and we're going to

do that did not go to the center like I

will intended grab those two and combine

those points shift R for radius

quarter inch radius seventy-five clothes

will pad it's one inch tall so there is

a model I want to add a directional

force like I've done in the last video

this time we'll do it at an angle so it

takes three points to define a plane so

plane to find I can sketch on this and

we'll do something like in fact I'll

import this corner and I'll do something

like a four angle we can establish now

you listen like twenty five degrees

I'll make this four inches close that

and hide my plane so let's go back to

the FAA workbench and from here I'll add

in some basic constraints I'll start a

new analysis and we'll run a G mesh I'm

going to simply apply a default mesh but

and that did not seem to work I forgot

one thing

unless actually do this I'm going to

highlight my body or my pad here and now

say G mesh and now it's made a match

that's a that's a lot better we have a

measure era

fortunately I'm going to keep on going

so you can see the rest without any

delay so there's our standard mesh but

this is a curved surface and meshing

across the curved surface fundamentally

means approximation you need to

approximate if it's a curved surface so

one of the options for meshes is I can

of course say the same woman at my mesh

to be a maximum size of 50,000 remesh

this and you can see it's taking time to

calculate this in free cab to calculate

a 50,000 that

you know just a lot more processing and

when I go to run the analysis it's going

to be a lot more analysis time so we

we're finally done we have a small

mesh and that's you know that's one way

to do it but that just took a long time

so what I'm going to do is let my pad

gene match we're going to mesh at a

regular amount and now if I highlight my

mesh here I had the option for creating

a mesh region so I can add a face and

choose all the mesh on that face is

going to be 50 sow in inches okay so

I've added this sort of sub mesh region

if I show my mesh nothing has changed

right but now that I have this sub mesh

region I can double click and say apply

and now we're meshing at fifty thousand

space and a default measure there where

else and you can see that the mesh goes

from small back to its default size

quite smoothly this gives us more

resolution where we care about having

more resolution but we've mesh much

faster than faster than last time and we

have still a reasonable amount of

computational power it's a way that we

can get the resolution we want without

going up that exponential curve I can

finish this study out I'll hide this

mesh and start adding a few things maybe

I can add in some fixed geometry here

and I'll add in a force acting on this

face let's go with let's go with that

and make this nine fifty or some number

like that well specify a direction and a

reference to this face reverse it

all right so that's our analysis thus

far in fact you know what

instead of this face let's do this

the circular face here putting the face

on where we have a lot of that

definition now I can specify material I

like calculate steel we're doing

imaginary examples okay and it looks

like we're ready to run so I actually

don't quickly calculates all right the

InP

run calculates all right so we've got a

result set and you can see if I do my

absolute displacement I can hide this

body we have a very high resolution of

computation on our round face and our

smooth flat faces that probably don't

require as much are less so does this

bias anything are we better off with a

machining region then with the generic

machinist so how much let's do a little

bit of visual visualization with this so

first off I will take a look at some

images that I've compiled so if I use

the pipeline visualization tool and

freecad there you can see on the left

without using regional mission there's

default mesh all the way through and

basically what we've made on the right

and you can download this file from my

grab CAD and the link in the description

if you want to check it out further we

have much better definition especially

looking at stress down here the stress

appears to go much higher than with a

higher resolution it sounds like you

have a better approximation and scaling

as well so that's strength and if we

take a look at a result mesh you know

higher definition this looks actually

quite similar

but when you come down to stress you can

see we have a far different scale of

stress and you can see what you think of

as a large stress being dispersed across

his face is really a stress

concentration at this face right so

having a higher resolution on this face

would be a great argument for adding a

measure to disperse the stress like a

fill it where is this it appears the

stress is going a lot more through the

face and this is just what they look

like displaced and that looks quite

somewhere between the two pictures so

you can't get a lot better visualization

results through this looks like I'm

already past 10 minutes so I'm going to

call this video hope this video is

helpful if it was please subscribe and

I'll see you

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