Load list of products from subcategory dynamically


I have a product page, where I want to list all of the products from a sub-category.

Category > Mtn > Series <- product page level.

Category > Mtn > Series > Model <- product sub category level.

          $  args = array(             'post_type' => 'product',              'posts_per_page' => 8,             'product_cat' => '**SubCategory goes here**',             'orderby'   => 'meta_value_num',             'meta_key'  => '_price',             'order' => 'asc'           );  $  loop = new WP_Query( $  args );             while ( $  loop->have_posts() ) : $  loop->the_post(); global $  product; ?>  show the producdts here.    <?php endwhile; ?>           <?php wp_reset_query(); ?> 

the code above works when I hard code the product_cat into the field,

How would I pass the subcategory of the current category into the product_cat field in the array dynamically for all products that fit in the same layout structure?